From 53da8893acb8b67e4d0daf05af71278e9cf73255 Mon Sep 17 00:00:00 2001
From: Andreas Kling <andreas@ladybird.org>
Date: Sun, 16 Mar 2025 21:25:29 -0500
Subject: [PATCH] LibJS: Replace PropertyKey(char[]) with
 PropertyKey(FlyString)

...and deal with the fallout.
---
 Libraries/LibJS/Bytecode/Interpreter.cpp      | 15 ++--
 Libraries/LibJS/Contrib/Test262/262Object.cpp | 16 ++---
 .../LibJS/Contrib/Test262/AgentObject.cpp     |  4 +-
 .../LibJS/Contrib/Test262/GlobalObject.cpp    |  4 +-
 Libraries/LibJS/CyclicModule.cpp              | 10 +--
 .../LibJS/Runtime/AbstractOperations.cpp      |  4 +-
 .../Runtime/AsyncDisposableStackPrototype.cpp |  2 +-
 .../AsyncFromSyncIteratorPrototype.cpp        |  2 +-
 .../Runtime/AsyncFunctionDriverWrapper.cpp    |  4 +-
 Libraries/LibJS/Runtime/AsyncGenerator.cpp    | 18 ++---
 Libraries/LibJS/Runtime/CommonPropertyNames.h |  3 +
 Libraries/LibJS/Runtime/Completion.cpp        |  4 +-
 .../Runtime/DisposableStackPrototype.cpp      |  2 +-
 Libraries/LibJS/Runtime/GeneratorObject.cpp   |  6 +-
 Libraries/LibJS/Runtime/Intrinsics.cpp        |  2 +-
 Libraries/LibJS/Runtime/NativeFunction.h      |  2 +-
 Libraries/LibJS/Runtime/PromiseCapability.cpp |  2 +-
 Libraries/LibJS/Runtime/PromisePrototype.cpp  |  8 +--
 Libraries/LibJS/Runtime/PropertyKey.h         |  5 +-
 Libraries/LibJS/Runtime/ProxyConstructor.cpp  |  2 +-
 Libraries/LibJS/Runtime/ShadowRealm.cpp       |  2 +-
 Libraries/LibJS/Runtime/StringPrototype.cpp   |  2 +-
 Libraries/LibTest/JavaScriptTestRunner.h      |  6 +-
 .../LibWeb/Animations/KeyframeEffect.cpp      |  6 +-
 Libraries/LibWeb/Bindings/MainThreadVM.cpp    |  4 +-
 Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp  | 72 +++++++++----------
 Libraries/LibWeb/Crypto/CryptoAlgorithms.h    |  2 +-
 Libraries/LibWeb/Crypto/CryptoBindings.cpp    | 34 ++++-----
 Libraries/LibWeb/Crypto/CryptoKey.cpp         |  6 +-
 Libraries/LibWeb/Crypto/KeyAlgorithms.cpp     | 16 ++---
 Libraries/LibWeb/Crypto/SubtleCrypto.cpp      |  4 +-
 Libraries/LibWeb/DOM/EventTarget.cpp          |  2 +-
 .../HTML/CrossOrigin/AbstractOperations.cpp   |  6 +-
 Libraries/LibWeb/HTML/HTMLDialogElement.cpp   |  4 +-
 Libraries/LibWeb/HTML/HTMLElement.cpp         |  2 +-
 Libraries/LibWeb/HTML/HTMLInputElement.cpp    | 24 +++----
 Libraries/LibWeb/HTML/Scripting/ImportMap.cpp | 12 ++--
 .../LibWeb/HTML/UniversalGlobalScope.cpp      |  4 +-
 Libraries/LibWeb/HTML/Window.cpp              |  2 +-
 .../LibWeb/HTML/WindowOrWorkerGlobalScope.cpp |  2 +-
 Libraries/LibWeb/IndexedDB/IDBFactory.cpp     |  4 +-
 Libraries/LibWeb/Internals/Internals.cpp      |  4 +-
 .../MediaCapabilities.cpp                     |  6 +-
 Libraries/LibWeb/Streams/Transformer.cpp      | 16 ++---
 Libraries/LibWeb/Streams/UnderlyingSink.cpp   | 12 ++--
 Libraries/LibWeb/Streams/UnderlyingSource.cpp | 12 ++--
 Libraries/LibWeb/WebAssembly/WebAssembly.cpp  |  4 +-
 .../LibWeb/WebGL/WebGLContextAttributes.cpp   | 18 ++---
 Libraries/LibWeb/WebIDL/Promise.cpp           |  8 +--
 .../BindingsGenerator/IDLGenerators.cpp       | 36 +++++-----
 .../GenerateWindowOrWorkerInterfaces.cpp      | 12 ++--
 .../ConsoleGlobalEnvironmentExtensions.cpp    |  8 +--
 Tests/LibJS/test262-runner.cpp                |  8 +--
 Tests/LibWasm/test-wasm.cpp                   |  6 +-
 Utilities/js.cpp                              | 24 +++----
 55 files changed, 254 insertions(+), 251 deletions(-)

diff --git a/Libraries/LibJS/Bytecode/Interpreter.cpp b/Libraries/LibJS/Bytecode/Interpreter.cpp
index 1d40f18586e..347c3cd7869 100644
--- a/Libraries/LibJS/Bytecode/Interpreter.cpp
+++ b/Libraries/LibJS/Bytecode/Interpreter.cpp
@@ -193,16 +193,16 @@ ALWAYS_INLINE void Interpreter::set(Operand op, Value value)
 ALWAYS_INLINE Value Interpreter::do_yield(Value value, Optional<Label> continuation)
 {
     auto object = Object::create(realm(), nullptr);
-    object->define_direct_property("result", value, JS::default_attributes);
+    object->define_direct_property(m_vm.names.result, value, JS::default_attributes);
 
     if (continuation.has_value())
         // FIXME: If we get a pointer, which is not accurately representable as a double
         //        will cause this to explode
-        object->define_direct_property("continuation", Value(continuation->address()), JS::default_attributes);
+        object->define_direct_property(m_vm.names.continuation, Value(continuation->address()), JS::default_attributes);
     else
-        object->define_direct_property("continuation", js_null(), JS::default_attributes);
+        object->define_direct_property(m_vm.names.continuation, js_null(), JS::default_attributes);
 
-    object->define_direct_property("isAwait", Value(false), JS::default_attributes);
+    object->define_direct_property(m_vm.names.isAwait, Value(false), JS::default_attributes);
     return object;
 }
 
@@ -2842,13 +2842,14 @@ void PrepareYield::execute_impl(Bytecode::Interpreter& interpreter) const
 
 void Await::execute_impl(Bytecode::Interpreter& interpreter) const
 {
+    auto& vm = interpreter.vm();
     auto yielded_value = interpreter.get(m_argument).value_or(js_undefined());
     auto object = Object::create(interpreter.realm(), nullptr);
-    object->define_direct_property("result", yielded_value, JS::default_attributes);
+    object->define_direct_property(vm.names.result, yielded_value, JS::default_attributes);
     // FIXME: If we get a pointer, which is not accurately representable as a double
     //        will cause this to explode
-    object->define_direct_property("continuation", Value(m_continuation_label.address()), JS::default_attributes);
-    object->define_direct_property("isAwait", Value(true), JS::default_attributes);
+    object->define_direct_property(vm.names.continuation, Value(m_continuation_label.address()), JS::default_attributes);
+    object->define_direct_property(vm.names.isAwait, Value(true), JS::default_attributes);
     interpreter.do_return(object);
 }
 
diff --git a/Libraries/LibJS/Contrib/Test262/262Object.cpp b/Libraries/LibJS/Contrib/Test262/262Object.cpp
index fe12d36a4ee..c24e086f45e 100644
--- a/Libraries/LibJS/Contrib/Test262/262Object.cpp
+++ b/Libraries/LibJS/Contrib/Test262/262Object.cpp
@@ -36,15 +36,15 @@ void $262Object::initialize(Realm& realm)
     m_is_htmldda = realm.create<IsHTMLDDA>(realm);
 
     u8 attr = Attribute::Writable | Attribute::Configurable;
-    define_native_function(realm, "clearKeptObjects", clear_kept_objects, 0, attr);
-    define_native_function(realm, "createRealm", create_realm, 0, attr);
-    define_native_function(realm, "detachArrayBuffer", detach_array_buffer, 1, attr);
-    define_native_function(realm, "evalScript", eval_script, 1, attr);
+    define_native_function(realm, "clearKeptObjects"_fly_string, clear_kept_objects, 0, attr);
+    define_native_function(realm, "createRealm"_fly_string, create_realm, 0, attr);
+    define_native_function(realm, "detachArrayBuffer"_fly_string, detach_array_buffer, 1, attr);
+    define_native_function(realm, "evalScript"_fly_string, eval_script, 1, attr);
 
-    define_direct_property("agent", m_agent, attr);
-    define_direct_property("gc", realm.global_object().get_without_side_effects("gc"), attr);
-    define_direct_property("global", &realm.global_object(), attr);
-    define_direct_property("IsHTMLDDA", m_is_htmldda, attr);
+    define_direct_property("agent"_fly_string, m_agent, attr);
+    define_direct_property("gc"_fly_string, realm.global_object().get_without_side_effects("gc"_fly_string), attr);
+    define_direct_property("global"_fly_string, &realm.global_object(), attr);
+    define_direct_property("IsHTMLDDA"_fly_string, m_is_htmldda, attr);
 }
 
 void $262Object::visit_edges(Cell::Visitor& visitor)
diff --git a/Libraries/LibJS/Contrib/Test262/AgentObject.cpp b/Libraries/LibJS/Contrib/Test262/AgentObject.cpp
index 3f34714b072..95bb7efda61 100644
--- a/Libraries/LibJS/Contrib/Test262/AgentObject.cpp
+++ b/Libraries/LibJS/Contrib/Test262/AgentObject.cpp
@@ -24,8 +24,8 @@ void AgentObject::initialize(JS::Realm& realm)
     Base::initialize(realm);
 
     u8 attr = Attribute::Writable | Attribute::Configurable;
-    define_native_function(realm, "monotonicNow", monotonic_now, 0, attr);
-    define_native_function(realm, "sleep", sleep, 1, attr);
+    define_native_function(realm, "monotonicNow"_fly_string, monotonic_now, 0, attr);
+    define_native_function(realm, "sleep"_fly_string, sleep, 1, attr);
     // TODO: broadcast
     // TODO: getReport
     // TODO: start
diff --git a/Libraries/LibJS/Contrib/Test262/GlobalObject.cpp b/Libraries/LibJS/Contrib/Test262/GlobalObject.cpp
index 76396ab4ffb..9aee7a63d52 100644
--- a/Libraries/LibJS/Contrib/Test262/GlobalObject.cpp
+++ b/Libraries/LibJS/Contrib/Test262/GlobalObject.cpp
@@ -24,8 +24,8 @@ void GlobalObject::initialize(Realm& realm)
 
     // https://github.com/tc39/test262/blob/master/INTERPRETING.md#host-defined-functions
     u8 attr = Attribute::Writable | Attribute::Configurable;
-    define_native_function(realm, "print", print, 1, attr);
-    define_direct_property("$262", m_$262, attr);
+    define_native_function(realm, "print"_fly_string, print, 1, attr);
+    define_direct_property("$262"_fly_string, m_$262, attr);
 }
 
 void GlobalObject::visit_edges(Cell::Visitor& visitor)
diff --git a/Libraries/LibJS/CyclicModule.cpp b/Libraries/LibJS/CyclicModule.cpp
index 00659cb670f..5ed335efab2 100644
--- a/Libraries/LibJS/CyclicModule.cpp
+++ b/Libraries/LibJS/CyclicModule.cpp
@@ -611,7 +611,7 @@ void CyclicModule::execute_async_module(VM& vm)
     };
 
     // 5. Let onFulfilled be CreateBuiltinFunction(fulfilledClosure, 0, "", « »).
-    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 0, "");
+    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 0);
 
     // 6. Let rejectedClosure be a new Abstract Closure with parameters (error) that captures module and performs the following steps when called:
     auto rejected_closure = [&](VM& vm) -> ThrowCompletionOr<Value> {
@@ -625,7 +625,7 @@ void CyclicModule::execute_async_module(VM& vm)
     };
 
     // 7. Let onRejected be CreateBuiltinFunction(rejectedClosure, 0, "", « »).
-    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 0, "");
+    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 0);
 
     // 8. Perform PerformPromiseThen(capability.[[Promise]], onFulfilled, onRejected).
     as<Promise>(capability->promise().ptr())->perform_then(on_fulfilled, on_rejected, {});
@@ -863,7 +863,7 @@ void continue_dynamic_import(GC::Ref<PromiseCapability> promise_capability, Thro
     };
 
     // 5. Let onRejected be CreateBuiltinFunction(rejectedClosure, 1, "", « »).
-    auto on_rejected = NativeFunction::create(*vm.current_realm(), move(reject_closure), 1, "");
+    auto on_rejected = NativeFunction::create(*vm.current_realm(), move(reject_closure), 1);
 
     // 6. Let linkAndEvaluateClosure be a new Abstract Closure with no parameters that captures module, promiseCapability,
     //    and onRejected and performs the following steps when called:
@@ -897,7 +897,7 @@ void continue_dynamic_import(GC::Ref<PromiseCapability> promise_capability, Thro
         };
 
         // e. Let onFulfilled be CreateBuiltinFunction(fulfilledClosure, 0, "", « »).
-        auto on_fulfilled = NativeFunction::create(*vm.current_realm(), move(fulfilled_closure), 0, "");
+        auto on_fulfilled = NativeFunction::create(*vm.current_realm(), move(fulfilled_closure), 0);
 
         // f. Perform PerformPromiseThen(evaluatePromise, onFulfilled, onRejected).
         evaluate_promise.value()->perform_then(on_fulfilled, on_rejected, {});
@@ -907,7 +907,7 @@ void continue_dynamic_import(GC::Ref<PromiseCapability> promise_capability, Thro
     };
 
     // 7. Let linkAndEvaluate be CreateBuiltinFunction(linkAndEvaluateClosure, 0, "", « »).
-    auto link_and_evaluate = NativeFunction::create(*vm.current_realm(), move(link_and_evaluate_closure), 0, "");
+    auto link_and_evaluate = NativeFunction::create(*vm.current_realm(), move(link_and_evaluate_closure), 0);
 
     // 8. Perform PerformPromiseThen(loadPromise, linkAndEvaluate, onRejected).
     // FIXME: This is likely a spec bug, see load_requested_modules.
diff --git a/Libraries/LibJS/Runtime/AbstractOperations.cpp b/Libraries/LibJS/Runtime/AbstractOperations.cpp
index ece1d8f3ac6..1089d36f123 100644
--- a/Libraries/LibJS/Runtime/AbstractOperations.cpp
+++ b/Libraries/LibJS/Runtime/AbstractOperations.cpp
@@ -233,7 +233,7 @@ ThrowCompletionOr<void> initialize_bound_name(VM& vm, DeprecatedFlyString const&
 bool is_compatible_property_descriptor(bool extensible, PropertyDescriptor const& descriptor, Optional<PropertyDescriptor> const& current)
 {
     // 1. Return ValidateAndApplyPropertyDescriptor(undefined, "", Extensible, Desc, Current).
-    return validate_and_apply_property_descriptor(nullptr, "", extensible, descriptor, current);
+    return validate_and_apply_property_descriptor(nullptr, FlyString {}, extensible, descriptor, current);
 }
 
 // 10.1.6.3 ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current ), https://tc39.es/ecma262/#sec-validateandapplypropertydescriptor
@@ -1544,7 +1544,7 @@ ThrowCompletionOr<GC::Ptr<FunctionObject>> get_dispose_method(VM& vm, Value valu
                 //    thrown synchronously.
 
                 // 3. Return CreateBuiltinFunction(closure, 0, "", « »).
-                return NativeFunction::create(realm, move(closure), 0, "");
+                return NativeFunction::create(realm, move(closure), 0);
             }
         }
     }
diff --git a/Libraries/LibJS/Runtime/AsyncDisposableStackPrototype.cpp b/Libraries/LibJS/Runtime/AsyncDisposableStackPrototype.cpp
index b206236e56e..fc7d3386b8f 100644
--- a/Libraries/LibJS/Runtime/AsyncDisposableStackPrototype.cpp
+++ b/Libraries/LibJS/Runtime/AsyncDisposableStackPrototype.cpp
@@ -68,7 +68,7 @@ JS_DEFINE_NATIVE_FUNCTION(AsyncDisposableStackPrototype::adopt)
     };
 
     // 6. Let F be CreateBuiltinFunction(closure, 0, "", « »).
-    auto function = NativeFunction::create(realm, move(closure), 0, "");
+    auto function = NativeFunction::create(realm, move(closure), 0);
 
     // 7. Perform ? AddDisposableResource(asyncDisposableStack.[[DisposeCapability]], undefined, async-dispose, F).
     TRY(add_disposable_resource(vm, async_disposable_stack->dispose_capability(), js_undefined(), Environment::InitializeBindingHint::AsyncDispose, function));
diff --git a/Libraries/LibJS/Runtime/AsyncFromSyncIteratorPrototype.cpp b/Libraries/LibJS/Runtime/AsyncFromSyncIteratorPrototype.cpp
index 0e77eb1aa82..b8624ab376d 100644
--- a/Libraries/LibJS/Runtime/AsyncFromSyncIteratorPrototype.cpp
+++ b/Libraries/LibJS/Runtime/AsyncFromSyncIteratorPrototype.cpp
@@ -58,7 +58,7 @@ static Object* async_from_sync_iterator_continuation(VM& vm, Object& result, Pro
 
     // 9. Let onFulfilled be CreateBuiltinFunction(unwrap, 1, "", « »).
     // 10. NOTE: onFulfilled is used when processing the "value" property of an IteratorResult object in order to wait for its value if it is a promise and re-package the result in a new "unwrapped" IteratorResult object.
-    auto on_fulfilled = NativeFunction::create(realm, move(unwrap), 1, "");
+    auto on_fulfilled = NativeFunction::create(realm, move(unwrap), 1);
 
     // 11. Perform PerformPromiseThen(valueWrapper, onFulfilled, undefined, promiseCapability).
     as<Promise>(value_wrapper)->perform_then(move(on_fulfilled), js_undefined(), &promise_capability);
diff --git a/Libraries/LibJS/Runtime/AsyncFunctionDriverWrapper.cpp b/Libraries/LibJS/Runtime/AsyncFunctionDriverWrapper.cpp
index fd5124aa3fb..755a80b8438 100644
--- a/Libraries/LibJS/Runtime/AsyncFunctionDriverWrapper.cpp
+++ b/Libraries/LibJS/Runtime/AsyncFunctionDriverWrapper.cpp
@@ -75,7 +75,7 @@ ThrowCompletionOr<void> AsyncFunctionDriverWrapper::await(JS::Value value)
     };
 
     // 4. Let onFulfilled be CreateBuiltinFunction(fulfilledClosure, 1, "", « »).
-    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1, "");
+    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1);
 
     // 5. Let rejectedClosure be a new Abstract Closure with parameters (reason) that captures asyncContext and performs the
     //    following steps when called:
@@ -103,7 +103,7 @@ ThrowCompletionOr<void> AsyncFunctionDriverWrapper::await(JS::Value value)
     };
 
     // 6. Let onRejected be CreateBuiltinFunction(rejectedClosure, 1, "", « »).
-    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1, "");
+    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1);
 
     // 7. Perform PerformPromiseThen(promise, onFulfilled, onRejected).
     m_current_promise = as<Promise>(promise_object);
diff --git a/Libraries/LibJS/Runtime/AsyncGenerator.cpp b/Libraries/LibJS/Runtime/AsyncGenerator.cpp
index 513d5bf5979..8cb67cfe4b7 100644
--- a/Libraries/LibJS/Runtime/AsyncGenerator.cpp
+++ b/Libraries/LibJS/Runtime/AsyncGenerator.cpp
@@ -104,7 +104,7 @@ ThrowCompletionOr<void> AsyncGenerator::await(Value value)
     };
 
     // 4. Let onFulfilled be CreateBuiltinFunction(fulfilledClosure, 1, "", « »).
-    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1, "");
+    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1);
 
     // 5. Let rejectedClosure be a new Abstract Closure with parameters (reason) that captures asyncContext and performs the
     //    following steps when called:
@@ -131,7 +131,7 @@ ThrowCompletionOr<void> AsyncGenerator::await(Value value)
     };
 
     // 6. Let onRejected be CreateBuiltinFunction(rejectedClosure, 1, "", « »).
-    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1, "");
+    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1);
 
     // 7. Perform PerformPromiseThen(promise, onFulfilled, onRejected).
     m_current_promise = as<Promise>(promise_object);
@@ -155,15 +155,15 @@ void AsyncGenerator::execute(VM& vm, Completion completion)
         // Loosely based on step 4 of https://tc39.es/ecma262/#sec-asyncgeneratorstart
         VERIFY(completion.value().has_value());
 
-        auto generated_value = [](Value value) -> Value {
+        auto generated_value = [&vm](Value value) -> Value {
             if (value.is_object())
-                return value.as_object().get_without_side_effects("result");
+                return value.as_object().get_without_side_effects(vm.names.result);
             return value.is_empty() ? js_undefined() : value;
         };
 
         auto generated_continuation = [&](Value value) -> Optional<size_t> {
             if (value.is_object()) {
-                auto number_value = value.as_object().get_without_side_effects("continuation");
+                auto number_value = value.as_object().get_without_side_effects(vm.names.continuation);
                 if (number_value.is_null())
                     return {};
                 return static_cast<size_t>(number_value.as_double());
@@ -171,9 +171,9 @@ void AsyncGenerator::execute(VM& vm, Completion completion)
             return {};
         };
 
-        auto generated_is_await = [](Value value) -> bool {
+        auto generated_is_await = [&vm](Value value) -> bool {
             if (value.is_object())
-                return value.as_object().get_without_side_effects("isAwait").as_bool();
+                return value.as_object().get_without_side_effects(vm.names.isAwait).as_bool();
             return false;
         };
 
@@ -393,7 +393,7 @@ void AsyncGenerator::await_return()
     };
 
     // 11. Let onFulfilled be CreateBuiltinFunction(fulfilledClosure, 1, "", « »).
-    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1, "");
+    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1);
 
     // 12. Let rejectedClosure be a new Abstract Closure with parameters (reason) that captures generator and performs
     //    the following steps when called:
@@ -415,7 +415,7 @@ void AsyncGenerator::await_return()
     };
 
     // 13. Let onRejected be CreateBuiltinFunction(rejectedClosure, 1, "", « »).
-    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1, "");
+    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1);
 
     // 14. Perform PerformPromiseThen(promise, onFulfilled, onRejected).
     // NOTE: await_return should only be called when the generator is in SuspendedStart or Completed state,
diff --git a/Libraries/LibJS/Runtime/CommonPropertyNames.h b/Libraries/LibJS/Runtime/CommonPropertyNames.h
index 229539f4c98..cbc0c874d9c 100644
--- a/Libraries/LibJS/Runtime/CommonPropertyNames.h
+++ b/Libraries/LibJS/Runtime/CommonPropertyNames.h
@@ -92,6 +92,7 @@ namespace JS {
     P(construct)                             \
     P(constructor)                           \
     P(containing)                            \
+    P(continuation)                          \
     P(copyWithin)                            \
     P(cos)                                   \
     P(cosh)                                  \
@@ -277,6 +278,7 @@ namespace JS {
     P(Intl)                                  \
     P(is)                                    \
     P(isArray)                               \
+    P(isAwait)                               \
     P(isDisjointFrom)                        \
     P(isError)                               \
     P(isExtensible)                          \
@@ -408,6 +410,7 @@ namespace JS {
     P(reason)                                \
     P(reduce)                                \
     P(reduceRight)                           \
+    P(result)                                \
     P(Reflect)                               \
     P(RegExp)                                \
     P(region)                                \
diff --git a/Libraries/LibJS/Runtime/Completion.cpp b/Libraries/LibJS/Runtime/Completion.cpp
index d8cc544aa27..f0104c617ad 100644
--- a/Libraries/LibJS/Runtime/Completion.cpp
+++ b/Libraries/LibJS/Runtime/Completion.cpp
@@ -66,7 +66,7 @@ ThrowCompletionOr<Value> await(VM& vm, Value value)
     };
 
     // 4. Let onFulfilled be CreateBuiltinFunction(fulfilledClosure, 1, "", « »).
-    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1, "");
+    auto on_fulfilled = NativeFunction::create(realm, move(fulfilled_closure), 1);
 
     // 5. Let rejectedClosure be a new Abstract Closure with parameters (reason) that captures asyncContext and performs the following steps when called:
     auto rejected_closure = [&success, &result](VM& vm) -> ThrowCompletionOr<Value> {
@@ -90,7 +90,7 @@ ThrowCompletionOr<Value> await(VM& vm, Value value)
     };
 
     // 6. Let onRejected be CreateBuiltinFunction(rejectedClosure, 1, "", « »).
-    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1, "");
+    auto on_rejected = NativeFunction::create(realm, move(rejected_closure), 1);
 
     // 7. Perform PerformPromiseThen(promise, onFulfilled, onRejected).
     auto promise = as<Promise>(promise_object);
diff --git a/Libraries/LibJS/Runtime/DisposableStackPrototype.cpp b/Libraries/LibJS/Runtime/DisposableStackPrototype.cpp
index d44f951a9e0..5d3eb434957 100644
--- a/Libraries/LibJS/Runtime/DisposableStackPrototype.cpp
+++ b/Libraries/LibJS/Runtime/DisposableStackPrototype.cpp
@@ -67,7 +67,7 @@ JS_DEFINE_NATIVE_FUNCTION(DisposableStackPrototype::adopt)
     };
 
     // 6. Let F be CreateBuiltinFunction(closure, 0, "", « »).
-    auto function = NativeFunction::create(realm, move(closure), 0, "");
+    auto function = NativeFunction::create(realm, move(closure), 0);
 
     // 7. Perform ? AddDisposableResource(disposableStack.[[DisposeCapability]], undefined, sync-dispose, F).
     TRY(add_disposable_resource(vm, disposable_stack->dispose_capability(), js_undefined(), Environment::InitializeBindingHint::SyncDispose, function));
diff --git a/Libraries/LibJS/Runtime/GeneratorObject.cpp b/Libraries/LibJS/Runtime/GeneratorObject.cpp
index f46a4d84a8e..6eda3221060 100644
--- a/Libraries/LibJS/Runtime/GeneratorObject.cpp
+++ b/Libraries/LibJS/Runtime/GeneratorObject.cpp
@@ -82,15 +82,15 @@ ThrowCompletionOr<Value> GeneratorObject::execute(VM& vm, Completion const& comp
 
     VERIFY(completion.value().has_value());
 
-    auto generated_value = [](Value value) -> Value {
+    auto generated_value = [&vm](Value value) -> Value {
         if (value.is_object())
-            return value.as_object().get_without_side_effects("result");
+            return value.as_object().get_without_side_effects(vm.names.result);
         return value.is_empty() ? js_undefined() : value;
     };
 
     auto generated_continuation = [&](Value value) -> Optional<size_t> {
         if (value.is_object()) {
-            auto number_value = value.as_object().get_without_side_effects("continuation");
+            auto number_value = value.as_object().get_without_side_effects(vm.names.continuation);
             if (number_value.is_null())
                 return {};
             return static_cast<u64>(number_value.as_double());
diff --git a/Libraries/LibJS/Runtime/Intrinsics.cpp b/Libraries/LibJS/Runtime/Intrinsics.cpp
index 35a7bb06870..244a527f7af 100644
--- a/Libraries/LibJS/Runtime/Intrinsics.cpp
+++ b/Libraries/LibJS/Runtime/Intrinsics.cpp
@@ -246,7 +246,7 @@ void Intrinsics::initialize_intrinsics(Realm& realm)
         realm, [](VM& vm) {
             return vm.throw_completion<TypeError>(ErrorType::RestrictedFunctionPropertiesAccess);
         },
-        0, "", &realm);
+        0, FlyString {}, &realm);
     m_throw_type_error_function->define_direct_property(vm.names.length, Value(0), 0);
     m_throw_type_error_function->define_direct_property(vm.names.name, PrimitiveString::create(vm, String {}), 0);
     MUST(m_throw_type_error_function->internal_prevent_extensions());
diff --git a/Libraries/LibJS/Runtime/NativeFunction.h b/Libraries/LibJS/Runtime/NativeFunction.h
index 114668fbe38..f9c53c9696a 100644
--- a/Libraries/LibJS/Runtime/NativeFunction.h
+++ b/Libraries/LibJS/Runtime/NativeFunction.h
@@ -21,7 +21,7 @@ class NativeFunction : public FunctionObject {
     GC_DECLARE_ALLOCATOR(NativeFunction);
 
 public:
-    static GC::Ref<NativeFunction> create(Realm&, ESCAPING Function<ThrowCompletionOr<Value>(VM&)> behaviour, i32 length, PropertyKey const& name, Optional<Realm*> = {}, Optional<Object*> prototype = {}, Optional<StringView> const& prefix = {});
+    static GC::Ref<NativeFunction> create(Realm&, ESCAPING Function<ThrowCompletionOr<Value>(VM&)> behaviour, i32 length, PropertyKey const& name = FlyString {}, Optional<Realm*> = {}, Optional<Object*> prototype = {}, Optional<StringView> const& prefix = {});
     static GC::Ref<NativeFunction> create(Realm&, DeprecatedFlyString const& name, ESCAPING Function<ThrowCompletionOr<Value>(VM&)>);
 
     virtual ~NativeFunction() override = default;
diff --git a/Libraries/LibJS/Runtime/PromiseCapability.cpp b/Libraries/LibJS/Runtime/PromiseCapability.cpp
index e7de078bfde..e2b41331d8d 100644
--- a/Libraries/LibJS/Runtime/PromiseCapability.cpp
+++ b/Libraries/LibJS/Runtime/PromiseCapability.cpp
@@ -90,7 +90,7 @@ ThrowCompletionOr<GC::Ref<PromiseCapability>> new_promise_capability(VM& vm, Val
     };
 
     // 5. Let executor be CreateBuiltinFunction(executorClosure, 2, "", « »).
-    auto executor = NativeFunction::create(realm, move(executor_closure), 2, "");
+    auto executor = NativeFunction::create(realm, move(executor_closure), 2);
 
     // 6. Let promise be ? Construct(C, « executor »).
     auto promise = TRY(construct(vm, constructor.as_function(), executor));
diff --git a/Libraries/LibJS/Runtime/PromisePrototype.cpp b/Libraries/LibJS/Runtime/PromisePrototype.cpp
index 5fc19905bb7..f2c37be6d1e 100644
--- a/Libraries/LibJS/Runtime/PromisePrototype.cpp
+++ b/Libraries/LibJS/Runtime/PromisePrototype.cpp
@@ -121,14 +121,14 @@ JS_DEFINE_NATIVE_FUNCTION(PromisePrototype::finally)
             };
 
             // iv. Let valueThunk be CreateBuiltinFunction(returnValue, 0, "", « »).
-            auto value_thunk = NativeFunction::create(realm, move(return_value), 0, "");
+            auto value_thunk = NativeFunction::create(realm, move(return_value), 0);
 
             // v. Return ? Invoke(promise, "then", « valueThunk »).
             return TRY(Value(promise).invoke(vm, vm.names.then, value_thunk));
         };
 
         // b. Let thenFinally be CreateBuiltinFunction(thenFinallyClosure, 1, "", « »).
-        then_finally = NativeFunction::create(realm, move(then_finally_closure), 1, "");
+        then_finally = NativeFunction::create(realm, move(then_finally_closure), 1);
 
         // c. Let catchFinallyClosure be a new Abstract Closure with parameters (reason) that captures onFinally and C and performs the following steps when called:
         auto catch_finally_closure = [constructor, on_finally](auto& vm) -> ThrowCompletionOr<Value> {
@@ -148,14 +148,14 @@ JS_DEFINE_NATIVE_FUNCTION(PromisePrototype::finally)
             };
 
             // iv. Let thrower be CreateBuiltinFunction(throwReason, 0, "", « »).
-            auto thrower = NativeFunction::create(realm, move(throw_reason), 0, "");
+            auto thrower = NativeFunction::create(realm, move(throw_reason), 0);
 
             // v. Return ? Invoke(promise, "then", « thrower »).
             return TRY(Value(promise).invoke(vm, vm.names.then, thrower));
         };
 
         // d. Let catchFinally be CreateBuiltinFunction(catchFinallyClosure, 1, "", « »).
-        catch_finally = NativeFunction::create(realm, move(catch_finally_closure), 1, "");
+        catch_finally = NativeFunction::create(realm, move(catch_finally_closure), 1);
     }
 
     // 7. Return ? Invoke(promise, "then", « thenFinally, catchFinally »).
diff --git a/Libraries/LibJS/Runtime/PropertyKey.h b/Libraries/LibJS/Runtime/PropertyKey.h
index c91a4568e50..ec363f116f9 100644
--- a/Libraries/LibJS/Runtime/PropertyKey.h
+++ b/Libraries/LibJS/Runtime/PropertyKey.h
@@ -61,9 +61,8 @@ public:
     {
     }
 
-    template<size_t N>
-    PropertyKey(char const (&chars)[N])
-        : PropertyKey(DeprecatedFlyString(chars))
+    PropertyKey(FlyString const& string)
+        : PropertyKey(string.to_deprecated_fly_string())
     {
     }
 
diff --git a/Libraries/LibJS/Runtime/ProxyConstructor.cpp b/Libraries/LibJS/Runtime/ProxyConstructor.cpp
index af74524fda3..10ac30b2682 100644
--- a/Libraries/LibJS/Runtime/ProxyConstructor.cpp
+++ b/Libraries/LibJS/Runtime/ProxyConstructor.cpp
@@ -108,7 +108,7 @@ JS_DEFINE_NATIVE_FUNCTION(ProxyConstructor::revocable)
 
     // 3. Let revoker be CreateBuiltinFunction(revokerClosure, 0, "", « [[RevocableProxy]] »).
     // 4. Set revoker.[[RevocableProxy]] to p.
-    auto revoker = NativeFunction::create(realm, move(revoker_closure), 0, "");
+    auto revoker = NativeFunction::create(realm, move(revoker_closure), 0);
 
     // 5. Let result be OrdinaryObjectCreate(%Object.prototype%).
     auto result = Object::create(realm, realm.intrinsics().object_prototype());
diff --git a/Libraries/LibJS/Runtime/ShadowRealm.cpp b/Libraries/LibJS/Runtime/ShadowRealm.cpp
index 7157dda97d6..35a6667abb5 100644
--- a/Libraries/LibJS/Runtime/ShadowRealm.cpp
+++ b/Libraries/LibJS/Runtime/ShadowRealm.cpp
@@ -253,7 +253,7 @@ ThrowCompletionOr<Value> shadow_realm_import_value(VM& vm, String specifier_stri
 
     // 10. Let onFulfilled be CreateBuiltinFunction(steps, 1, "", « [[ExportNameString]] », callerRealm).
     // 11. Set onFulfilled.[[ExportNameString]] to exportNameString.
-    auto on_fulfilled = NativeFunction::create(realm, move(steps), 1, "", &caller_realm);
+    auto on_fulfilled = NativeFunction::create(realm, move(steps), 1, FlyString {}, &caller_realm);
 
     // 12. Let promiseCapability be ! NewPromiseCapability(%Promise%).
     auto promise_capability = MUST(new_promise_capability(vm, realm.intrinsics().promise_constructor()));
diff --git a/Libraries/LibJS/Runtime/StringPrototype.cpp b/Libraries/LibJS/Runtime/StringPrototype.cpp
index e7a92543d24..f549493d8c8 100644
--- a/Libraries/LibJS/Runtime/StringPrototype.cpp
+++ b/Libraries/LibJS/Runtime/StringPrototype.cpp
@@ -603,7 +603,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::match_all)
         // b. If isRegExp is true, then
         if (is_regexp) {
             // i. Let flags be ? Get(regexp, "flags").
-            auto flags = TRY(regexp.as_object().get("flags"));
+            auto flags = TRY(regexp.as_object().get(vm.names.flags));
 
             // ii. Perform ? RequireObjectCoercible(flags).
             auto flags_object = TRY(require_object_coercible(vm, flags));
diff --git a/Libraries/LibTest/JavaScriptTestRunner.h b/Libraries/LibTest/JavaScriptTestRunner.h
index 8c51977e4b2..7d979c31102 100644
--- a/Libraries/LibTest/JavaScriptTestRunner.h
+++ b/Libraries/LibTest/JavaScriptTestRunner.h
@@ -185,7 +185,7 @@ inline void TestRunnerGlobalObject::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_direct_property("global", this, JS::Attribute::Enumerable);
+    define_direct_property("global"_fly_string, this, JS::Attribute::Enumerable);
     for (auto& entry : s_exposed_global_functions) {
         define_native_function(
             realm,
@@ -242,7 +242,7 @@ inline AK::Result<GC::Ref<JS::SourceTextModule>, ParserError> parse_module(Strin
 
 inline ErrorOr<JsonValue> get_test_results(JS::Realm& realm)
 {
-    auto results = MUST(realm.global_object().get("__TestResults__"));
+    auto results = MUST(realm.global_object().get("__TestResults__"_fly_string));
     auto maybe_json_string = MUST(JS::JSONObject::stringify_impl(*g_vm, results, JS::js_undefined(), JS::js_undefined()));
     if (maybe_json_string.has_value())
         return JsonValue::from_string(*maybe_json_string);
@@ -362,7 +362,7 @@ inline JSFileResult TestRunner::run_file_test(ByteString const& test_path)
     JSFileResult file_result { test_path.substring(m_test_root.length() + 1, test_path.length() - m_test_root.length() - 1) };
 
     // Collect logged messages
-    auto user_output = MUST(realm->global_object().get("__UserOutput__"));
+    auto user_output = MUST(realm->global_object().get("__UserOutput__"_fly_string));
 
     auto& arr = user_output.as_array();
     for (auto& entry : arr.indexed_properties()) {
diff --git a/Libraries/LibWeb/Animations/KeyframeEffect.cpp b/Libraries/LibWeb/Animations/KeyframeEffect.cpp
index a3871722802..b668b7d602d 100644
--- a/Libraries/LibWeb/Animations/KeyframeEffect.cpp
+++ b/Libraries/LibWeb/Animations/KeyframeEffect.cpp
@@ -104,13 +104,13 @@ static WebIDL::ExceptionOr<KeyframeType<AL>> process_a_keyframe_like_object(JS::
         return keyframe_output;
 
     auto& keyframe_object = keyframe_input.as_object();
-    auto composite = TRY(keyframe_object.get("composite"));
+    auto composite = TRY(keyframe_object.get("composite"_fly_string));
     if (composite.is_undefined())
         composite = JS::PrimitiveString::create(vm, "auto"_string);
-    auto easing = TRY(keyframe_object.get("easing"));
+    auto easing = TRY(keyframe_object.get("easing"_fly_string));
     if (easing.is_undefined())
         easing = JS::PrimitiveString::create(vm, "linear"_string);
-    auto offset = TRY(keyframe_object.get("offset"));
+    auto offset = TRY(keyframe_object.get("offset"_fly_string));
 
     if constexpr (AL == AllowLists::Yes) {
         keyframe_output.composite = TRY(convert_value_to_maybe_list(realm, composite, to_composite_operation));
diff --git a/Libraries/LibWeb/Bindings/MainThreadVM.cpp b/Libraries/LibWeb/Bindings/MainThreadVM.cpp
index 38ef537bdd7..ba0569094a7 100644
--- a/Libraries/LibWeb/Bindings/MainThreadVM.cpp
+++ b/Libraries/LibWeb/Bindings/MainThreadVM.cpp
@@ -381,8 +381,8 @@ ErrorOr<void> initialize_main_thread_vm(HTML::EventLoop::Type type)
 
         // 5. Return « Record { [[Key]]: "url", [[Value]]: urlString }, Record { [[Key]]: "resolve", [[Value]]: resolveFunction } ».
         HashMap<JS::PropertyKey, JS::Value> meta;
-        meta.set("url", JS::PrimitiveString::create(vm, move(url_string)));
-        meta.set("resolve", resolve_function);
+        meta.set("url"_fly_string, JS::PrimitiveString::create(vm, move(url_string)));
+        meta.set("resolve"_fly_string, resolve_function);
 
         return meta;
     };
diff --git a/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp b/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
index 3157e490c42..9ac38d71952 100644
--- a/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
+++ b/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
@@ -337,7 +337,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> AesCbcParams::from_value(J
 {
     auto& object = value.as_object();
 
-    auto iv_value = TRY(object.get("iv"));
+    auto iv_value = TRY(object.get("iv"_fly_string));
     if (!iv_value.is_object() || !(is<JS::TypedArrayBase>(iv_value.as_object()) || is<JS::ArrayBuffer>(iv_value.as_object()) || is<JS::DataView>(iv_value.as_object())))
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
     auto iv = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(iv_value.as_object()));
@@ -351,12 +351,12 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> AesCtrParams::from_value(J
 {
     auto& object = value.as_object();
 
-    auto iv_value = TRY(object.get("counter"));
+    auto iv_value = TRY(object.get("counter"_fly_string));
     if (!iv_value.is_object() || !(is<JS::TypedArrayBase>(iv_value.as_object()) || is<JS::ArrayBuffer>(iv_value.as_object()) || is<JS::DataView>(iv_value.as_object())))
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
     auto iv = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(iv_value.as_object()));
 
-    auto length_value = TRY(object.get("length"));
+    auto length_value = TRY(object.get("length"_fly_string));
     auto length = TRY(length_value.to_u8(vm));
 
     return adopt_own<AlgorithmParams>(*new AesCtrParams { iv, length });
@@ -368,22 +368,22 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> AesGcmParams::from_value(J
 {
     auto& object = value.as_object();
 
-    auto iv_value = TRY(object.get("iv"));
+    auto iv_value = TRY(object.get("iv"_fly_string));
     if (!iv_value.is_object() || !(is<JS::TypedArrayBase>(iv_value.as_object()) || is<JS::ArrayBuffer>(iv_value.as_object()) || is<JS::DataView>(iv_value.as_object())))
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
     auto iv = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(iv_value.as_object()));
 
     auto maybe_additional_data = Optional<ByteBuffer> {};
-    if (MUST(object.has_property("additionalData"))) {
-        auto additional_data_value = TRY(object.get("additionalData"));
+    if (MUST(object.has_property("additionalData"_fly_string))) {
+        auto additional_data_value = TRY(object.get("additionalData"_fly_string));
         if (!additional_data_value.is_object() || !(is<JS::TypedArrayBase>(additional_data_value.as_object()) || is<JS::ArrayBuffer>(additional_data_value.as_object()) || is<JS::DataView>(additional_data_value.as_object())))
             return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
         maybe_additional_data = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(additional_data_value.as_object()));
     }
 
     auto maybe_tag_length = Optional<u8> {};
-    if (MUST(object.has_property("tagLength"))) {
-        auto tag_length_value = TRY(object.get("tagLength"));
+    if (MUST(object.has_property("tagLength"_fly_string))) {
+        auto tag_length_value = TRY(object.get("tagLength"_fly_string));
         maybe_tag_length = TRY(tag_length_value.to_u8(vm));
     }
 
@@ -396,15 +396,15 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> HKDFParams::from_value(JS:
 {
     auto& object = value.as_object();
 
-    auto hash_value = TRY(object.get("hash"));
+    auto hash_value = TRY(object.get("hash"_fly_string));
     auto hash = TRY(hash_algorithm_identifier_from_value(vm, hash_value));
 
-    auto salt_value = TRY(object.get("salt"));
+    auto salt_value = TRY(object.get("salt"_fly_string));
     if (!salt_value.is_object() || !(is<JS::TypedArrayBase>(salt_value.as_object()) || is<JS::ArrayBuffer>(salt_value.as_object()) || is<JS::DataView>(salt_value.as_object())))
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
     auto salt = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(salt_value.as_object()));
 
-    auto info_value = TRY(object.get("info"));
+    auto info_value = TRY(object.get("info"_fly_string));
     if (!info_value.is_object() || !(is<JS::TypedArrayBase>(info_value.as_object()) || is<JS::ArrayBuffer>(info_value.as_object()) || is<JS::DataView>(info_value.as_object())))
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
     auto info = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(info_value.as_object()));
@@ -418,17 +418,17 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> PBKDF2Params::from_value(J
 {
     auto& object = value.as_object();
 
-    auto salt_value = TRY(object.get("salt"));
+    auto salt_value = TRY(object.get("salt"_fly_string));
 
     if (!salt_value.is_object() || !(is<JS::TypedArrayBase>(salt_value.as_object()) || is<JS::ArrayBuffer>(salt_value.as_object()) || is<JS::DataView>(salt_value.as_object())))
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
 
     auto salt = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(salt_value.as_object()));
 
-    auto iterations_value = TRY(object.get("iterations"));
+    auto iterations_value = TRY(object.get("iterations"_fly_string));
     auto iterations = TRY(iterations_value.to_u32(vm));
 
-    auto hash_value = TRY(object.get("hash"));
+    auto hash_value = TRY(object.get("hash"_fly_string));
     auto hash = TRY(hash_algorithm_identifier_from_value(vm, hash_value));
 
     return adopt_own<AlgorithmParams>(*new PBKDF2Params { salt, iterations, hash });
@@ -440,10 +440,10 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> RsaKeyGenParams::from_valu
 {
     auto& object = value.as_object();
 
-    auto modulus_length_value = TRY(object.get("modulusLength"));
+    auto modulus_length_value = TRY(object.get("modulusLength"_fly_string));
     auto modulus_length = TRY(modulus_length_value.to_u32(vm));
 
-    auto public_exponent_value = TRY(object.get("publicExponent"));
+    auto public_exponent_value = TRY(object.get("publicExponent"_fly_string));
     GC::Ptr<JS::Uint8Array> public_exponent;
 
     if (!public_exponent_value.is_object() || !is<JS::Uint8Array>(public_exponent_value.as_object()))
@@ -460,10 +460,10 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> RsaHashedKeyGenParams::fro
 {
     auto& object = value.as_object();
 
-    auto modulus_length_value = TRY(object.get("modulusLength"));
+    auto modulus_length_value = TRY(object.get("modulusLength"_fly_string));
     auto modulus_length = TRY(modulus_length_value.to_u32(vm));
 
-    auto public_exponent_value = TRY(object.get("publicExponent"));
+    auto public_exponent_value = TRY(object.get("publicExponent"_fly_string));
     GC::Ptr<JS::Uint8Array> public_exponent;
 
     if (!public_exponent_value.is_object() || !is<JS::Uint8Array>(public_exponent_value.as_object()))
@@ -471,7 +471,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> RsaHashedKeyGenParams::fro
 
     public_exponent = static_cast<JS::Uint8Array&>(public_exponent_value.as_object());
 
-    auto hash_value = TRY(object.get("hash"));
+    auto hash_value = TRY(object.get("hash"_fly_string));
     auto hash = TRY(hash_algorithm_identifier_from_value(vm, hash_value));
 
     return adopt_own<AlgorithmParams>(*new RsaHashedKeyGenParams { modulus_length, big_integer_from_api_big_integer(public_exponent), hash });
@@ -483,7 +483,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> RsaHashedImportParams::fro
 {
     auto& object = value.as_object();
 
-    auto hash_value = TRY(object.get("hash"));
+    auto hash_value = TRY(object.get("hash"_fly_string));
     auto hash = TRY(hash_algorithm_identifier_from_value(vm, hash_value));
 
     return adopt_own<AlgorithmParams>(*new RsaHashedImportParams { hash });
@@ -495,7 +495,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> RsaOaepParams::from_value(
 {
     auto& object = value.as_object();
 
-    auto label_value = TRY(object.get("label"));
+    auto label_value = TRY(object.get("label"_fly_string));
 
     ByteBuffer label;
     if (!label_value.is_nullish()) {
@@ -515,7 +515,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> RsaPssParams::from_value(J
 {
     auto& object = value.as_object();
 
-    auto salt_length_value = TRY(object.get("saltLength"));
+    auto salt_length_value = TRY(object.get("saltLength"_fly_string));
     auto salt_length = TRY(salt_length_value.to_u32(vm));
 
     return adopt_own<AlgorithmParams>(*new RsaPssParams { salt_length });
@@ -527,7 +527,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> EcdsaParams::from_value(JS
 {
     auto& object = value.as_object();
 
-    auto hash_value = TRY(object.get("hash"));
+    auto hash_value = TRY(object.get("hash"_fly_string));
     auto hash = TRY(hash_algorithm_identifier_from_value(vm, hash_value));
 
     return adopt_own<AlgorithmParams>(*new EcdsaParams { hash });
@@ -539,7 +539,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> EcKeyGenParams::from_value
 {
     auto& object = value.as_object();
 
-    auto curve_value = TRY(object.get("namedCurve"));
+    auto curve_value = TRY(object.get("namedCurve"_fly_string));
     auto curve = TRY(curve_value.to_string(vm));
 
     return adopt_own<AlgorithmParams>(*new EcKeyGenParams { curve });
@@ -551,7 +551,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> AesKeyGenParams::from_valu
 {
     auto& object = value.as_object();
 
-    auto length_value = TRY(object.get("length"));
+    auto length_value = TRY(object.get("length"_fly_string));
     auto length = TRY(length_value.to_u16(vm));
 
     return adopt_own<AlgorithmParams>(*new AesKeyGenParams { length });
@@ -563,7 +563,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> AesDerivedKeyParams::from_
 {
     auto& object = value.as_object();
 
-    auto length_value = TRY(object.get("length"));
+    auto length_value = TRY(object.get("length"_fly_string));
     auto length = TRY(length_value.to_u16(vm));
 
     return adopt_own<AlgorithmParams>(*new AesDerivedKeyParams { length });
@@ -575,7 +575,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> EcdhKeyDeriveParams::from_
 {
     auto& object = value.as_object();
 
-    auto key_value = TRY(object.get("public"));
+    auto key_value = TRY(object.get("public"_fly_string));
     auto key_object = TRY(key_value.to_object(vm));
 
     if (!is<CryptoKey>(*key_object)) {
@@ -593,7 +593,7 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> EcKeyImportParams::from_va
 {
     auto& object = value.as_object();
 
-    auto named_curve_value = TRY(object.get("namedCurve"));
+    auto named_curve_value = TRY(object.get("namedCurve"_fly_string));
     auto named_curve = TRY(named_curve_value.to_string(vm));
 
     return adopt_own<AlgorithmParams>(*new EcKeyImportParams { named_curve });
@@ -605,12 +605,12 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> HmacImportParams::from_val
 {
     auto& object = value.as_object();
 
-    auto hash_value = TRY(object.get("hash"));
+    auto hash_value = TRY(object.get("hash"_fly_string));
     auto hash = TRY(hash_algorithm_identifier_from_value(vm, hash_value));
 
     auto maybe_length = Optional<WebIDL::UnsignedLong> {};
-    if (MUST(object.has_property("length"))) {
-        auto length_value = TRY(object.get("length"));
+    if (MUST(object.has_property("length"_fly_string))) {
+        auto length_value = TRY(object.get("length"_fly_string));
         maybe_length = TRY(length_value.to_u32(vm));
     }
 
@@ -623,12 +623,12 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> HmacKeyGenParams::from_val
 {
     auto& object = value.as_object();
 
-    auto hash_value = TRY(object.get("hash"));
+    auto hash_value = TRY(object.get("hash"_fly_string));
     auto hash = TRY(hash_algorithm_identifier_from_value(vm, hash_value));
 
     auto maybe_length = Optional<WebIDL::UnsignedLong> {};
-    if (MUST(object.has_property("length"))) {
-        auto length_value = TRY(object.get("length"));
+    if (MUST(object.has_property("length"_fly_string))) {
+        auto length_value = TRY(object.get("length"_fly_string));
         maybe_length = TRY(length_value.to_u32(vm));
     }
 
@@ -642,8 +642,8 @@ JS::ThrowCompletionOr<NonnullOwnPtr<AlgorithmParams>> Ed448Params::from_value(JS
     auto& object = value.as_object();
 
     auto maybe_context = Optional<ByteBuffer> {};
-    if (MUST(object.has_property("context"))) {
-        auto context_value = TRY(object.get("context"));
+    if (MUST(object.has_property("context"_fly_string))) {
+        auto context_value = TRY(object.get("context"_fly_string));
         if (!context_value.is_object() || !(is<JS::TypedArrayBase>(context_value.as_object()) || is<JS::ArrayBuffer>(context_value.as_object()) || is<JS::DataView>(context_value.as_object())))
             return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "BufferSource");
         maybe_context = TRY_OR_THROW_OOM(vm, WebIDL::get_buffer_source_copy(context_value.as_object()));
diff --git a/Libraries/LibWeb/Crypto/CryptoAlgorithms.h b/Libraries/LibWeb/Crypto/CryptoAlgorithms.h
index 14d19c06c40..e9267261578 100644
--- a/Libraries/LibWeb/Crypto/CryptoAlgorithms.h
+++ b/Libraries/LibWeb/Crypto/CryptoAlgorithms.h
@@ -34,7 +34,7 @@ struct HashAlgorithmIdentifier : public AlgorithmIdentifier {
         auto value = visit(
             [](String const& name) -> JS::ThrowCompletionOr<String> { return name; },
             [&](GC::Root<JS::Object> const& obj) -> JS::ThrowCompletionOr<String> {
-                auto name_property = TRY(obj->get("name"));
+                auto name_property = TRY(obj->get("name"_fly_string));
                 return name_property.to_string(vm);
             });
 
diff --git a/Libraries/LibWeb/Crypto/CryptoBindings.cpp b/Libraries/LibWeb/Crypto/CryptoBindings.cpp
index f2371bcdd26..ea88f15def1 100644
--- a/Libraries/LibWeb/Crypto/CryptoBindings.cpp
+++ b/Libraries/LibWeb/Crypto/CryptoBindings.cpp
@@ -91,63 +91,63 @@ JS::ThrowCompletionOr<GC::Ref<JS::Object>> JsonWebKey::to_object(JS::Realm& real
     auto object = JS::Object::create(realm, realm.intrinsics().object_prototype());
 
     if (kty.has_value())
-        TRY(object->create_data_property("kty", JS::PrimitiveString::create(vm, kty.value())));
+        TRY(object->create_data_property("kty"_fly_string, JS::PrimitiveString::create(vm, kty.value())));
 
     if (use.has_value())
-        TRY(object->create_data_property("use", JS::PrimitiveString::create(vm, use.value())));
+        TRY(object->create_data_property("use"_fly_string, JS::PrimitiveString::create(vm, use.value())));
 
     if (key_ops.has_value()) {
         auto key_ops_array = JS::Array::create_from<String>(realm, key_ops.value().span(), [&](auto& key_usage) -> JS::Value {
             return JS::PrimitiveString::create(realm.vm(), key_usage);
         });
-        TRY(object->create_data_property("key_ops", move(key_ops_array)));
+        TRY(object->create_data_property("key_ops"_fly_string, move(key_ops_array)));
     }
 
     if (alg.has_value())
-        TRY(object->create_data_property("alg", JS::PrimitiveString::create(vm, alg.value())));
+        TRY(object->create_data_property("alg"_fly_string, JS::PrimitiveString::create(vm, alg.value())));
 
     if (ext.has_value())
-        TRY(object->create_data_property("ext", JS::Value(ext.value())));
+        TRY(object->create_data_property("ext"_fly_string, JS::Value(ext.value())));
 
     if (crv.has_value())
-        TRY(object->create_data_property("crv", JS::PrimitiveString::create(vm, crv.value())));
+        TRY(object->create_data_property("crv"_fly_string, JS::PrimitiveString::create(vm, crv.value())));
 
     if (x.has_value())
-        TRY(object->create_data_property("x", JS::PrimitiveString::create(vm, x.value())));
+        TRY(object->create_data_property("x"_fly_string, JS::PrimitiveString::create(vm, x.value())));
 
     if (y.has_value())
-        TRY(object->create_data_property("y", JS::PrimitiveString::create(vm, y.value())));
+        TRY(object->create_data_property("y"_fly_string, JS::PrimitiveString::create(vm, y.value())));
 
     if (d.has_value())
-        TRY(object->create_data_property("d", JS::PrimitiveString::create(vm, d.value())));
+        TRY(object->create_data_property("d"_fly_string, JS::PrimitiveString::create(vm, d.value())));
 
     if (n.has_value())
-        TRY(object->create_data_property("n", JS::PrimitiveString::create(vm, n.value())));
+        TRY(object->create_data_property("n"_fly_string, JS::PrimitiveString::create(vm, n.value())));
 
     if (e.has_value())
-        TRY(object->create_data_property("e", JS::PrimitiveString::create(vm, e.value())));
+        TRY(object->create_data_property("e"_fly_string, JS::PrimitiveString::create(vm, e.value())));
 
     if (p.has_value())
-        TRY(object->create_data_property("p", JS::PrimitiveString::create(vm, p.value())));
+        TRY(object->create_data_property("p"_fly_string, JS::PrimitiveString::create(vm, p.value())));
 
     if (q.has_value())
-        TRY(object->create_data_property("q", JS::PrimitiveString::create(vm, q.value())));
+        TRY(object->create_data_property("q"_fly_string, JS::PrimitiveString::create(vm, q.value())));
 
     if (dp.has_value())
-        TRY(object->create_data_property("dp", JS::PrimitiveString::create(vm, dp.value())));
+        TRY(object->create_data_property("dp"_fly_string, JS::PrimitiveString::create(vm, dp.value())));
 
     if (dq.has_value())
-        TRY(object->create_data_property("dq", JS::PrimitiveString::create(vm, dq.value())));
+        TRY(object->create_data_property("dq"_fly_string, JS::PrimitiveString::create(vm, dq.value())));
 
     if (qi.has_value())
-        TRY(object->create_data_property("qi", JS::PrimitiveString::create(vm, qi.value())));
+        TRY(object->create_data_property("qi"_fly_string, JS::PrimitiveString::create(vm, qi.value())));
 
     if (oth.has_value()) {
         TODO();
     }
 
     if (k.has_value())
-        TRY(object->create_data_property("k", JS::PrimitiveString::create(vm, k.value())));
+        TRY(object->create_data_property("k"_fly_string, JS::PrimitiveString::create(vm, k.value())));
 
     return object;
 }
diff --git a/Libraries/LibWeb/Crypto/CryptoKey.cpp b/Libraries/LibWeb/Crypto/CryptoKey.cpp
index 975a2647b8d..8c55b975173 100644
--- a/Libraries/LibWeb/Crypto/CryptoKey.cpp
+++ b/Libraries/LibWeb/Crypto/CryptoKey.cpp
@@ -75,7 +75,7 @@ void CryptoKey::set_usages(Vector<Bindings::KeyUsage> usages)
 String CryptoKey::algorithm_name() const
 {
     if (m_algorithm_name.is_empty()) {
-        auto name = MUST(m_algorithm->get("name"));
+        auto name = MUST(m_algorithm->get("name"_fly_string));
         m_algorithm_name = MUST(name.to_string(vm()));
     }
     return m_algorithm_name;
@@ -95,8 +95,8 @@ CryptoKeyPair::CryptoKeyPair(JS::Realm& realm, GC::Ref<CryptoKey> public_key, GC
 
 void CryptoKeyPair::initialize(JS::Realm& realm)
 {
-    define_native_accessor(realm, "publicKey", public_key_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
-    define_native_accessor(realm, "privateKey", private_key_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "publicKey"_fly_string, public_key_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "privateKey"_fly_string, private_key_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
 
     Base::initialize(realm);
 }
diff --git a/Libraries/LibWeb/Crypto/KeyAlgorithms.cpp b/Libraries/LibWeb/Crypto/KeyAlgorithms.cpp
index f544ea501c5..4349d61a15d 100644
--- a/Libraries/LibWeb/Crypto/KeyAlgorithms.cpp
+++ b/Libraries/LibWeb/Crypto/KeyAlgorithms.cpp
@@ -49,7 +49,7 @@ KeyAlgorithm::KeyAlgorithm(JS::Realm& realm)
 
 void KeyAlgorithm::initialize(JS::Realm& realm)
 {
-    define_native_accessor(realm, "name", name_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "name"_fly_string, name_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
     Base::initialize(realm);
 }
 
@@ -81,8 +81,8 @@ void RsaKeyAlgorithm::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_native_accessor(realm, "modulusLength", modulus_length_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
-    define_native_accessor(realm, "publicExponent", public_exponent_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "modulusLength"_fly_string, modulus_length_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "publicExponent"_fly_string, public_exponent_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
 }
 
 void RsaKeyAlgorithm::visit_edges(Visitor& visitor)
@@ -146,7 +146,7 @@ void EcKeyAlgorithm::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_native_accessor(realm, "namedCurve", named_curve_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "namedCurve"_fly_string, named_curve_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
 }
 
 JS_DEFINE_NATIVE_FUNCTION(EcKeyAlgorithm::named_curve_getter)
@@ -170,7 +170,7 @@ void RsaHashedKeyAlgorithm::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_native_accessor(realm, "hash", hash_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "hash"_fly_string, hash_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
 }
 
 JS_DEFINE_NATIVE_FUNCTION(RsaHashedKeyAlgorithm::hash_getter)
@@ -204,7 +204,7 @@ void AesKeyAlgorithm::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_native_accessor(realm, "length", length_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "length"_fly_string, length_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
 }
 
 JS_DEFINE_NATIVE_FUNCTION(AesKeyAlgorithm::length_getter)
@@ -227,8 +227,8 @@ HmacKeyAlgorithm::HmacKeyAlgorithm(JS::Realm& realm)
 void HmacKeyAlgorithm::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
-    define_native_accessor(realm, "hash", hash_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
-    define_native_accessor(realm, "length", length_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "hash"_fly_string, hash_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
+    define_native_accessor(realm, "length"_fly_string, length_getter, {}, JS::Attribute::Enumerable | JS::Attribute::Configurable);
 }
 
 void HmacKeyAlgorithm::visit_edges(JS::Cell::Visitor& visitor)
diff --git a/Libraries/LibWeb/Crypto/SubtleCrypto.cpp b/Libraries/LibWeb/Crypto/SubtleCrypto.cpp
index c52b13c8ea6..b1cb265020d 100644
--- a/Libraries/LibWeb/Crypto/SubtleCrypto.cpp
+++ b/Libraries/LibWeb/Crypto/SubtleCrypto.cpp
@@ -71,7 +71,7 @@ WebIDL::ExceptionOr<NormalizedAlgorithmAndParameter> normalize_an_algorithm(JS::
         // Return the result of running the normalize an algorithm algorithm,
         // with the alg set to a new Algorithm dictionary whose name attribute is alg, and with the op set to op.
         auto dictionary = GC::make_root(JS::Object::create(realm, realm.intrinsics().object_prototype()));
-        TRY(dictionary->create_data_property("name", JS::PrimitiveString::create(vm, algorithm.get<String>())));
+        TRY(dictionary->create_data_property("name"_fly_string, JS::PrimitiveString::create(vm, algorithm.get<String>())));
 
         return normalize_an_algorithm(realm, dictionary, operation);
     }
@@ -88,7 +88,7 @@ WebIDL::ExceptionOr<NormalizedAlgorithmAndParameter> normalize_an_algorithm(JS::
     // 3. If an error occurred, return the error and terminate this algorithm.
     // Note: We're not going to bother creating an Algorithm object, all we want is the name attribute so that we can
     //       fetch the actual algorithm factory from the registeredAlgorithms map.
-    auto initial_algorithm = TRY(algorithm.get<GC::Root<JS::Object>>()->get("name"));
+    auto initial_algorithm = TRY(algorithm.get<GC::Root<JS::Object>>()->get("name"_fly_string));
 
     if (initial_algorithm.is_undefined()) {
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "Algorithm");
diff --git a/Libraries/LibWeb/DOM/EventTarget.cpp b/Libraries/LibWeb/DOM/EventTarget.cpp
index ccbd356f423..b013493126d 100644
--- a/Libraries/LibWeb/DOM/EventTarget.cpp
+++ b/Libraries/LibWeb/DOM/EventTarget.cpp
@@ -614,7 +614,7 @@ void EventTarget::activate_event_handler(FlyString const& name, HTML::EventHandl
             TRY(event_target->process_event_handler_for_event(name, event));
             return JS::js_undefined();
         },
-        0, "", &realm);
+        0, FlyString {}, &realm);
 
     // NOTE: As per the spec, the callback context is arbitrary.
     auto callback = realm.heap().allocate<WebIDL::CallbackType>(*callback_function, realm);
diff --git a/Libraries/LibWeb/HTML/CrossOrigin/AbstractOperations.cpp b/Libraries/LibWeb/HTML/CrossOrigin/AbstractOperations.cpp
index 996fb03a85a..d02e2a11e27 100644
--- a/Libraries/LibWeb/HTML/CrossOrigin/AbstractOperations.cpp
+++ b/Libraries/LibWeb/HTML/CrossOrigin/AbstractOperations.cpp
@@ -139,7 +139,7 @@ Optional<JS::PropertyDescriptor> cross_origin_get_own_property_helper(Variant<HT
                     realm, [function = GC::make_root(*value)](auto& vm) {
                         return JS::call(vm, function.value(), JS::js_undefined(), vm.running_execution_context().arguments.span());
                     },
-                    0, "");
+                    0);
             }
 
             // 3. Set crossOriginDesc to PropertyDescriptor{ [[Value]]: value, [[Enumerable]]: false, [[Writable]]: false, [[Configurable]]: true }.
@@ -156,7 +156,7 @@ Optional<JS::PropertyDescriptor> cross_origin_get_own_property_helper(Variant<HT
                     realm, [object_ptr, getter = GC::make_root(*original_descriptor->get)](auto& vm) {
                         return JS::call(vm, getter.cell(), object_ptr, vm.running_execution_context().arguments.span());
                     },
-                    0, "");
+                    0);
             }
 
             // 3. Let crossOriginSet be undefined.
@@ -168,7 +168,7 @@ Optional<JS::PropertyDescriptor> cross_origin_get_own_property_helper(Variant<HT
                     realm, [object_ptr, setter = GC::make_root(*original_descriptor->set)](auto& vm) {
                         return JS::call(vm, setter.cell(), object_ptr, vm.running_execution_context().arguments.span());
                     },
-                    0, "");
+                    0);
             }
 
             // 5. Set crossOriginDesc to PropertyDescriptor{ [[Get]]: crossOriginGet, [[Set]]: crossOriginSet, [[Enumerable]]: false, [[Configurable]]: true }.
diff --git a/Libraries/LibWeb/HTML/HTMLDialogElement.cpp b/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
index 6d7e5a44c92..d2fe4534011 100644
--- a/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
@@ -385,7 +385,7 @@ void HTMLDialogElement::set_close_watcher()
                 event.prevent_default();
             return JS::js_undefined();
         },
-        0, "", &realm());
+        0, ""_fly_string, &realm());
     auto cancel_callback = realm().heap().allocate<WebIDL::CallbackType>(*cancel_callback_function, realm());
     m_close_watcher->add_event_listener_without_options(HTML::EventNames::cancel, DOM::IDLEventListener::create(realm(), cancel_callback));
     // - closeAction being to close the dialog given dialog and dialog's request close return value.
@@ -395,7 +395,7 @@ void HTMLDialogElement::set_close_watcher()
 
             return JS::js_undefined();
         },
-        0, "", &realm());
+        0, ""_fly_string, &realm());
     auto close_callback = realm().heap().allocate<WebIDL::CallbackType>(*close_callback_function, realm());
     m_close_watcher->add_event_listener_without_options(HTML::EventNames::close, DOM::IDLEventListener::create(realm(), close_callback));
     // - getEnabledState being to return true if dialog's enable close watcher for requestClose() is true or dialog's computed closed-by state is not None; otherwise false.
diff --git a/Libraries/LibWeb/HTML/HTMLElement.cpp b/Libraries/LibWeb/HTML/HTMLElement.cpp
index 188743b00c5..a19927021f4 100644
--- a/Libraries/LibWeb/HTML/HTMLElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLElement.cpp
@@ -1332,7 +1332,7 @@ WebIDL::ExceptionOr<void> HTMLElement::show_popover(ThrowExceptions throw_except
 
                 return JS::js_undefined();
             },
-            0, "", &realm());
+            0, FlyString {}, &realm());
         auto close_callback = realm().heap().allocate<WebIDL::CallbackType>(*close_callback_function, realm());
         m_popover_close_watcher->add_event_listener_without_options(HTML::EventNames::close, DOM::IDLEventListener::create(realm(), close_callback));
         // - getEnabledState being to return true.
diff --git a/Libraries/LibWeb/HTML/HTMLInputElement.cpp b/Libraries/LibWeb/HTML/HTMLInputElement.cpp
index 67788647970..87b0a660eee 100644
--- a/Libraries/LibWeb/HTML/HTMLInputElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLInputElement.cpp
@@ -1051,7 +1051,7 @@ void HTMLInputElement::create_text_input_shadow_tree()
                 commit_pending_changes();
                 return JS::js_undefined();
             },
-            0, "", &realm());
+            0, FlyString {}, &realm());
         auto mouseup_callback = realm().heap().allocate<WebIDL::CallbackType>(*mouseup_callback_function, realm());
         DOM::AddEventListenerOptions mouseup_listener_options;
         mouseup_listener_options.once = true;
@@ -1064,7 +1064,7 @@ void HTMLInputElement::create_text_input_shadow_tree()
                 }
                 return JS::js_undefined();
             },
-            0, "", &realm());
+            0, FlyString {}, &realm());
         auto step_up_callback = realm().heap().allocate<WebIDL::CallbackType>(*up_callback_function, realm());
         up_button->add_event_listener_without_options(UIEvents::EventNames::mousedown, DOM::IDLEventListener::create(realm(), step_up_callback));
         up_button->add_event_listener_without_options(UIEvents::EventNames::mouseup, DOM::IDLEventListener::create(realm(), mouseup_callback));
@@ -1086,7 +1086,7 @@ void HTMLInputElement::create_text_input_shadow_tree()
                 }
                 return JS::js_undefined();
             },
-            0, "", &realm());
+            0, FlyString {}, &realm());
         auto step_down_callback = realm().heap().allocate<WebIDL::CallbackType>(*down_callback_function, realm());
         down_button->add_event_listener_without_options(UIEvents::EventNames::mousedown, DOM::IDLEventListener::create(realm(), step_down_callback));
         down_button->add_event_listener_without_options(UIEvents::EventNames::mouseup, DOM::IDLEventListener::create(realm(), mouseup_callback));
@@ -1147,7 +1147,7 @@ void HTMLInputElement::create_file_input_shadow_tree()
         return JS::js_undefined();
     };
 
-    auto on_button_click_function = JS::NativeFunction::create(realm, move(on_button_click), 0, "", &realm);
+    auto on_button_click_function = JS::NativeFunction::create(realm, move(on_button_click), 0, FlyString {}, &realm);
     auto on_button_click_callback = realm.heap().allocate<WebIDL::CallbackType>(on_button_click_function, realm);
     m_file_button->add_event_listener_without_options(UIEvents::EventNames::click, DOM::IDLEventListener::create(realm, on_button_click_callback));
 
@@ -1198,7 +1198,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
 
     auto keydown_callback_function = JS::NativeFunction::create(
         realm(), [this](JS::VM& vm) {
-            auto key = MUST(vm.argument(0).get(vm, "key")).as_string().utf8_string();
+            auto key = MUST(vm.argument(0).get(vm, "key"_fly_string)).as_string().utf8_string();
 
             if (key == "ArrowLeft" || key == "ArrowDown")
                 MUST(step_down());
@@ -1213,13 +1213,13 @@ void HTMLInputElement::create_range_input_shadow_tree()
             user_interaction_did_change_input_value();
             return JS::js_undefined();
         },
-        0, "", &realm());
+        0, ""_fly_string, &realm());
     auto keydown_callback = realm().heap().allocate<WebIDL::CallbackType>(*keydown_callback_function, realm());
     add_event_listener_without_options(UIEvents::EventNames::keydown, DOM::IDLEventListener::create(realm(), keydown_callback));
 
     auto wheel_callback_function = JS::NativeFunction::create(
         realm(), [this](JS::VM& vm) {
-            auto delta_y = MUST(vm.argument(0).get(vm, "deltaY")).as_i32();
+            auto delta_y = MUST(vm.argument(0).get(vm, "deltaY"_fly_string)).as_i32();
             if (delta_y > 0) {
                 MUST(step_down());
             } else {
@@ -1228,12 +1228,12 @@ void HTMLInputElement::create_range_input_shadow_tree()
             user_interaction_did_change_input_value();
             return JS::js_undefined();
         },
-        0, "", &realm());
+        0, ""_fly_string, &realm());
     auto wheel_callback = realm().heap().allocate<WebIDL::CallbackType>(*wheel_callback_function, realm());
     add_event_listener_without_options(UIEvents::EventNames::wheel, DOM::IDLEventListener::create(realm(), wheel_callback));
 
     auto update_slider_by_mouse = [this](JS::VM& vm) {
-        auto client_x = MUST(vm.argument(0).get(vm, "clientX")).as_double();
+        auto client_x = MUST(vm.argument(0).get(vm, "clientX"_fly_string)).as_double();
         auto rect = get_bounding_client_rect();
         double minimum = *min();
         double maximum = *max();
@@ -1251,7 +1251,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
                     update_slider_by_mouse(vm);
                     return JS::js_undefined();
                 },
-                0, "", &realm());
+                0, ""_fly_string, &realm());
             auto mousemove_callback = realm().heap().allocate<WebIDL::CallbackType>(*mousemove_callback_function, realm());
             auto mousemove_listener = DOM::IDLEventListener::create(realm(), mousemove_callback);
             auto& window = static_cast<HTML::Window&>(relevant_global_object(*this));
@@ -1263,7 +1263,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
                     window.remove_event_listener_without_options(UIEvents::EventNames::mousemove, mousemove_listener);
                     return JS::js_undefined();
                 },
-                0, "", &realm());
+                0, ""_fly_string, &realm());
             auto mouseup_callback = realm().heap().allocate<WebIDL::CallbackType>(*mouseup_callback_function, realm());
             DOM::AddEventListenerOptions mouseup_listener_options;
             mouseup_listener_options.once = true;
@@ -1271,7 +1271,7 @@ void HTMLInputElement::create_range_input_shadow_tree()
 
             return JS::js_undefined();
         },
-        0, "", &realm());
+        0, ""_fly_string, &realm());
     auto mousedown_callback = realm().heap().allocate<WebIDL::CallbackType>(*mousedown_callback_function, realm());
     add_event_listener_without_options(UIEvents::EventNames::mousedown, DOM::IDLEventListener::create(realm(), mousedown_callback));
 }
diff --git a/Libraries/LibWeb/HTML/Scripting/ImportMap.cpp b/Libraries/LibWeb/HTML/Scripting/ImportMap.cpp
index 589846e8015..0da652ce3a9 100644
--- a/Libraries/LibWeb/HTML/Scripting/ImportMap.cpp
+++ b/Libraries/LibWeb/HTML/Scripting/ImportMap.cpp
@@ -34,8 +34,8 @@ WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteStr
     ModuleSpecifierMap sorted_and_normalised_imports;
 
     // 4. If parsed["imports"] exists, then:
-    if (TRY(parsed_object.has_property("imports"))) {
-        auto imports = TRY(parsed_object.get("imports"));
+    if (TRY(parsed_object.has_property("imports"_fly_string))) {
+        auto imports = TRY(parsed_object.get("imports"_fly_string));
 
         // If parsed["imports"] is not an ordered map, then throw a TypeError indicating that the value for the "imports" top-level key needs to be a JSON object.
         if (!imports.is_object())
@@ -49,8 +49,8 @@ WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteStr
     HashMap<URL::URL, ModuleSpecifierMap> sorted_and_normalised_scopes;
 
     // 6. If parsed["scopes"] exists, then:
-    if (TRY(parsed_object.has_property("scopes"))) {
-        auto scopes = TRY(parsed_object.get("scopes"));
+    if (TRY(parsed_object.has_property("scopes"_fly_string))) {
+        auto scopes = TRY(parsed_object.get("scopes"_fly_string));
 
         // If parsed["scopes"] is not an ordered map, then throw a TypeError indicating that the value for the "scopes" top-level key needs to be a JSON object.
         if (!scopes.is_object())
@@ -64,8 +64,8 @@ WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteStr
     ModuleIntegrityMap normalised_integrity;
 
     // 8. If parsed["integrity"] exists, then:
-    if (TRY(parsed_object.has_property("integrity"))) {
-        auto integrity = TRY(parsed_object.get("integrity"));
+    if (TRY(parsed_object.has_property("integrity"_fly_string))) {
+        auto integrity = TRY(parsed_object.get("integrity"_fly_string));
 
         // 1. If parsed["integrity"] is not an ordered map, then throw a TypeError indicating that the value for the "integrity" top-level key needs to be a JSON object.
         if (!integrity.is_object())
diff --git a/Libraries/LibWeb/HTML/UniversalGlobalScope.cpp b/Libraries/LibWeb/HTML/UniversalGlobalScope.cpp
index 3199611b7fe..f769f572c1d 100644
--- a/Libraries/LibWeb/HTML/UniversalGlobalScope.cpp
+++ b/Libraries/LibWeb/HTML/UniversalGlobalScope.cpp
@@ -121,7 +121,7 @@ GC::Ref<WebIDL::CallbackType> UniversalGlobalScopeMixin::count_queuing_strategy_
         };
 
         // 2. Let F be ! CreateBuiltinFunction(steps, 0, "size", « », globalObject’s relevant Realm).
-        auto function = JS::NativeFunction::create(realm, move(steps), 0, "size", &realm);
+        auto function = JS::NativeFunction::create(realm, move(steps), 0, "size"_fly_string, &realm);
 
         // 3. Set globalObject’s count queuing strategy size function to a Function that represents a reference to F, with callback context equal to globalObject’s relevant settings object.
         // FIXME: Update spec comment to pass globalObject's relevant realm once Streams spec is updated for ShadowRealm spec
@@ -146,7 +146,7 @@ GC::Ref<WebIDL::CallbackType> UniversalGlobalScopeMixin::byte_length_queuing_str
         };
 
         // 2. Let F be ! CreateBuiltinFunction(steps, 1, "size", « », globalObject’s relevant Realm).
-        auto function = JS::NativeFunction::create(realm, move(steps), 1, "size", &realm);
+        auto function = JS::NativeFunction::create(realm, move(steps), 1, "size"_fly_string, &realm);
 
         // 3. Set globalObject’s byte length queuing strategy size function to a Function that represents a reference to F, with callback context equal to globalObject’s relevant settings object.
         // FIXME: Update spec comment to pass globalObject's relevant realm once Streams spec is updated for ShadowRealm spec
diff --git a/Libraries/LibWeb/HTML/Window.cpp b/Libraries/LibWeb/HTML/Window.cpp
index 2fe1d0b5a4b..a5a37752a58 100644
--- a/Libraries/LibWeb/HTML/Window.cpp
+++ b/Libraries/LibWeb/HTML/Window.cpp
@@ -734,7 +734,7 @@ WebIDL::ExceptionOr<void> Window::initialize_web_interfaces(Badge<WindowEnvironm
     WindowOrWorkerGlobalScopeMixin::initialize(realm);
 
     if (s_internals_object_exposed)
-        define_direct_property("internals", realm.create<Internals::Internals>(realm), JS::default_attributes);
+        define_direct_property("internals"_fly_string, realm.create<Internals::Internals>(realm), JS::default_attributes);
 
     if (url.scheme() == "about"sv && url.paths().size() == 1) {
         auto const& path = url.paths().first();
diff --git a/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp b/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp
index 88918547c88..1064aa39051 100644
--- a/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp
+++ b/Libraries/LibWeb/HTML/WindowOrWorkerGlobalScope.cpp
@@ -633,7 +633,7 @@ void WindowOrWorkerGlobalScopeMixin::queue_the_performance_observer_task()
             //    droppedEntriesCount if droppedEntriesCount is not null, otherwise unset.
             auto callback_options = JS::Object::create(realm, realm.intrinsics().object_prototype());
             if (dropped_entries_count.has_value())
-                MUST(callback_options->create_data_property("droppedEntriesCount", JS::Value(dropped_entries_count.value())));
+                MUST(callback_options->create_data_property("droppedEntriesCount"_fly_string, JS::Value(dropped_entries_count.value())));
 
             // 9. Call po’s observer callback with observerEntryList as the first argument, with po as the second
             //    argument and as callback this value, and with callbackOptions as the third argument.
diff --git a/Libraries/LibWeb/IndexedDB/IDBFactory.cpp b/Libraries/LibWeb/IndexedDB/IDBFactory.cpp
index 1f81deacd75..b70e404dc9f 100644
--- a/Libraries/LibWeb/IndexedDB/IDBFactory.cpp
+++ b/Libraries/LibWeb/IndexedDB/IDBFactory.cpp
@@ -215,8 +215,8 @@ GC::Ref<WebIDL::Promise> IDBFactory::databases()
             // 2. Set info’s name dictionary member to db’s name.
             // 3. Set info’s version dictionary member to db’s version.
             auto info = JS::Object::create(realm, realm.intrinsics().object_prototype());
-            MUST(info->create_data_property("name", JS::PrimitiveString::create(realm.vm(), db->name())));
-            MUST(info->create_data_property("version", JS::Value(db->version())));
+            MUST(info->create_data_property("name"_fly_string, JS::PrimitiveString::create(realm.vm(), db->name())));
+            MUST(info->create_data_property("version"_fly_string, JS::Value(db->version())));
 
             // 4. Append info to result.
             MUST(result->create_data_property_or_throw(i, info));
diff --git a/Libraries/LibWeb/Internals/Internals.cpp b/Libraries/LibWeb/Internals/Internals.cpp
index e717f496cd7..9d2ea04173f 100644
--- a/Libraries/LibWeb/Internals/Internals.cpp
+++ b/Libraries/LibWeb/Internals/Internals.cpp
@@ -63,8 +63,8 @@ JS::Object* Internals::hit_test(double x, double y)
     auto result = active_document.paintable_box()->hit_test({ x, y }, Painting::HitTestType::Exact);
     if (result.has_value()) {
         auto hit_tеsting_result = JS::Object::create(realm(), nullptr);
-        hit_tеsting_result->define_direct_property("node", result->dom_node(), JS::default_attributes);
-        hit_tеsting_result->define_direct_property("indexInNode", JS::Value(result->index_in_node), JS::default_attributes);
+        hit_tеsting_result->define_direct_property("node"_fly_string, result->dom_node(), JS::default_attributes);
+        hit_tеsting_result->define_direct_property("indexInNode"_fly_string, JS::Value(result->index_in_node), JS::default_attributes);
         return hit_tеsting_result;
     }
     return nullptr;
diff --git a/Libraries/LibWeb/MediaCapabilitiesAPI/MediaCapabilities.cpp b/Libraries/LibWeb/MediaCapabilitiesAPI/MediaCapabilities.cpp
index 854a3be8443..b958b635fe3 100644
--- a/Libraries/LibWeb/MediaCapabilitiesAPI/MediaCapabilities.cpp
+++ b/Libraries/LibWeb/MediaCapabilitiesAPI/MediaCapabilities.cpp
@@ -236,9 +236,9 @@ GC::Ref<JS::Object> MediaCapabilitiesDecodingInfo::to_object(JS::Realm& realm)
 
     // FIXME: Also include configuration in this object.
 
-    MUST(object->create_data_property("supported", JS::BooleanObject::create(realm, supported)));
-    MUST(object->create_data_property("smooth", JS::BooleanObject::create(realm, smooth)));
-    MUST(object->create_data_property("powerEfficent", JS::BooleanObject::create(realm, power_efficient)));
+    MUST(object->create_data_property("supported"_fly_string, JS::BooleanObject::create(realm, supported)));
+    MUST(object->create_data_property("smooth"_fly_string, JS::BooleanObject::create(realm, smooth)));
+    MUST(object->create_data_property("powerEfficent"_fly_string, JS::BooleanObject::create(realm, power_efficient)));
 
     return object;
 }
diff --git a/Libraries/LibWeb/Streams/Transformer.cpp b/Libraries/LibWeb/Streams/Transformer.cpp
index 3eaedc2e755..8134e01ed24 100644
--- a/Libraries/LibWeb/Streams/Transformer.cpp
+++ b/Libraries/LibWeb/Streams/Transformer.cpp
@@ -19,19 +19,19 @@ JS::ThrowCompletionOr<Transformer> Transformer::from_value(JS::VM& vm, JS::Value
     auto& object = value.as_object();
 
     Transformer transformer {
-        .start = TRY(WebIDL::property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
-        .transform = TRY(WebIDL::property_to_callback(vm, value, "transform", WebIDL::OperationReturnsPromise::Yes)),
-        .flush = TRY(WebIDL::property_to_callback(vm, value, "flush", WebIDL::OperationReturnsPromise::Yes)),
-        .cancel = TRY(WebIDL::property_to_callback(vm, value, "cancel", WebIDL::OperationReturnsPromise::Yes)),
+        .start = TRY(WebIDL::property_to_callback(vm, value, "start"_fly_string, WebIDL::OperationReturnsPromise::No)),
+        .transform = TRY(WebIDL::property_to_callback(vm, value, "transform"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
+        .flush = TRY(WebIDL::property_to_callback(vm, value, "flush"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
+        .cancel = TRY(WebIDL::property_to_callback(vm, value, "cancel"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
         .readable_type = {},
         .writable_type = {},
     };
 
-    if (TRY(object.has_property("readableType")))
-        transformer.readable_type = TRY(object.get("readableType"));
+    if (TRY(object.has_property("readableType"_fly_string)))
+        transformer.readable_type = TRY(object.get("readableType"_fly_string));
 
-    if (TRY(object.has_property("writableType")))
-        transformer.writable_type = TRY(object.get("writableType"));
+    if (TRY(object.has_property("writableType"_fly_string)))
+        transformer.writable_type = TRY(object.get("writableType"_fly_string));
 
     return transformer;
 }
diff --git a/Libraries/LibWeb/Streams/UnderlyingSink.cpp b/Libraries/LibWeb/Streams/UnderlyingSink.cpp
index cf036668f72..25ced48d5d3 100644
--- a/Libraries/LibWeb/Streams/UnderlyingSink.cpp
+++ b/Libraries/LibWeb/Streams/UnderlyingSink.cpp
@@ -19,15 +19,15 @@ JS::ThrowCompletionOr<UnderlyingSink> UnderlyingSink::from_value(JS::VM& vm, JS:
     auto& object = value.as_object();
 
     UnderlyingSink underlying_sink {
-        .start = TRY(WebIDL::property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
-        .write = TRY(WebIDL::property_to_callback(vm, value, "write", WebIDL::OperationReturnsPromise::Yes)),
-        .close = TRY(WebIDL::property_to_callback(vm, value, "close", WebIDL::OperationReturnsPromise::Yes)),
-        .abort = TRY(WebIDL::property_to_callback(vm, value, "abort", WebIDL::OperationReturnsPromise::Yes)),
+        .start = TRY(WebIDL::property_to_callback(vm, value, "start"_fly_string, WebIDL::OperationReturnsPromise::No)),
+        .write = TRY(WebIDL::property_to_callback(vm, value, "write"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
+        .close = TRY(WebIDL::property_to_callback(vm, value, "close"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
+        .abort = TRY(WebIDL::property_to_callback(vm, value, "abort"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
         .type = {},
     };
 
-    if (TRY(object.has_property("type")))
-        underlying_sink.type = TRY(object.get("type"));
+    if (TRY(object.has_property("type"_fly_string)))
+        underlying_sink.type = TRY(object.get("type"_fly_string));
 
     return underlying_sink;
 }
diff --git a/Libraries/LibWeb/Streams/UnderlyingSource.cpp b/Libraries/LibWeb/Streams/UnderlyingSource.cpp
index 3c1cf531116..3ce135ae34d 100644
--- a/Libraries/LibWeb/Streams/UnderlyingSource.cpp
+++ b/Libraries/LibWeb/Streams/UnderlyingSource.cpp
@@ -22,14 +22,14 @@ JS::ThrowCompletionOr<UnderlyingSource> UnderlyingSource::from_value(JS::VM& vm,
     auto& object = value.as_object();
 
     UnderlyingSource underlying_source {
-        .start = TRY(WebIDL::property_to_callback(vm, value, "start", WebIDL::OperationReturnsPromise::No)),
-        .pull = TRY(WebIDL::property_to_callback(vm, value, "pull", WebIDL::OperationReturnsPromise::Yes)),
-        .cancel = TRY(WebIDL::property_to_callback(vm, value, "cancel", WebIDL::OperationReturnsPromise::Yes)),
+        .start = TRY(WebIDL::property_to_callback(vm, value, "start"_fly_string, WebIDL::OperationReturnsPromise::No)),
+        .pull = TRY(WebIDL::property_to_callback(vm, value, "pull"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
+        .cancel = TRY(WebIDL::property_to_callback(vm, value, "cancel"_fly_string, WebIDL::OperationReturnsPromise::Yes)),
         .type = {},
         .auto_allocate_chunk_size = {},
     };
 
-    auto type_value = TRY(object.get("type"));
+    auto type_value = TRY(object.get("type"_fly_string));
     if (!type_value.is_undefined()) {
         auto type_string = TRY(type_value.to_string(vm));
         if (type_string == "bytes"sv)
@@ -38,8 +38,8 @@ JS::ThrowCompletionOr<UnderlyingSource> UnderlyingSource::from_value(JS::VM& vm,
             return vm.throw_completion<JS::TypeError>(MUST(String::formatted("Unknown stream type '{}'", type_value)));
     }
 
-    if (TRY(object.has_property("autoAllocateChunkSize"))) {
-        auto value = TRY(object.get("autoAllocateChunkSize"));
+    if (TRY(object.has_property("autoAllocateChunkSize"_fly_string))) {
+        auto value = TRY(object.get("autoAllocateChunkSize"_fly_string));
         underlying_source.auto_allocate_chunk_size = TRY(WebIDL::convert_to_int<WebIDL::UnsignedLongLong>(vm, value, WebIDL::EnforceRange::Yes));
     }
 
diff --git a/Libraries/LibWeb/WebAssembly/WebAssembly.cpp b/Libraries/LibWeb/WebAssembly/WebAssembly.cpp
index c61b2e99f03..209bf82bf9c 100644
--- a/Libraries/LibWeb/WebAssembly/WebAssembly.cpp
+++ b/Libraries/LibWeb/WebAssembly/WebAssembly.cpp
@@ -674,8 +674,8 @@ GC::Ref<WebIDL::Promise> instantiate_promise_of_module(JS::VM& vm, GC::Ref<WebID
 
             // 1. Let result be the WebAssemblyInstantiatedSource value «[ "module" → module, "instance" → instance ]».
             auto result = JS::Object::create(realm, nullptr);
-            result->define_direct_property("module", module, JS::default_attributes);
-            result->define_direct_property("instance", instance, JS::default_attributes);
+            result->define_direct_property("module"_fly_string, module, JS::default_attributes);
+            result->define_direct_property("instance"_fly_string, instance, JS::default_attributes);
 
             // 2. Resolve promise with result.
             WebIDL::resolve_promise(realm, promise, result);
diff --git a/Libraries/LibWeb/WebGL/WebGLContextAttributes.cpp b/Libraries/LibWeb/WebGL/WebGLContextAttributes.cpp
index 8837d55e092..5c9a7260df7 100644
--- a/Libraries/LibWeb/WebGL/WebGLContextAttributes.cpp
+++ b/Libraries/LibWeb/WebGL/WebGLContextAttributes.cpp
@@ -23,7 +23,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         alpha = JS::js_undefined();
     else
-        alpha = TRY(value.as_object().get("alpha"));
+        alpha = TRY(value.as_object().get("alpha"_fly_string));
 
     bool alpha_value;
     if (!alpha.is_undefined())
@@ -37,7 +37,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         antialias = JS::js_undefined();
     else
-        antialias = TRY(value.as_object().get("antialias"));
+        antialias = TRY(value.as_object().get("antialias"_fly_string));
 
     bool antialias_value;
     if (!antialias.is_undefined())
@@ -51,7 +51,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         depth = JS::js_undefined();
     else
-        depth = TRY(value.as_object().get("depth"));
+        depth = TRY(value.as_object().get("depth"_fly_string));
 
     bool depth_value;
     if (!depth.is_undefined())
@@ -65,7 +65,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         desynchronized = JS::js_undefined();
     else
-        desynchronized = TRY(value.as_object().get("desynchronized"));
+        desynchronized = TRY(value.as_object().get("desynchronized"_fly_string));
 
     bool desynchronized_value;
 
@@ -80,7 +80,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         fail_if_major_performance_caveat = JS::js_undefined();
     else
-        fail_if_major_performance_caveat = TRY(value.as_object().get("failIfMajorPerformanceCaveat"));
+        fail_if_major_performance_caveat = TRY(value.as_object().get("failIfMajorPerformanceCaveat"_fly_string));
 
     bool fail_if_major_performance_caveat_value;
     if (!fail_if_major_performance_caveat.is_undefined())
@@ -94,7 +94,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         power_preference = JS::js_undefined();
     else
-        power_preference = TRY(value.as_object().get("powerPreference"));
+        power_preference = TRY(value.as_object().get("powerPreference"_fly_string));
 
     Bindings::WebGLPowerPreference power_preference_value { Bindings::WebGLPowerPreference::Default };
 
@@ -117,7 +117,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         premultiplied_alpha = JS::js_undefined();
     else
-        premultiplied_alpha = TRY(value.as_object().get("premultipliedAlpha"));
+        premultiplied_alpha = TRY(value.as_object().get("premultipliedAlpha"_fly_string));
 
     bool premultiplied_alpha_value;
 
@@ -132,7 +132,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         preserve_drawing_buffer = JS::js_undefined();
     else
-        preserve_drawing_buffer = TRY(value.as_object().get("preserveDrawingBuffer"));
+        preserve_drawing_buffer = TRY(value.as_object().get("preserveDrawingBuffer"_fly_string));
 
     bool preserve_drawing_buffer_value;
     if (!preserve_drawing_buffer.is_undefined())
@@ -146,7 +146,7 @@ JS::ThrowCompletionOr<WebGLContextAttributes> convert_value_to_context_attribute
     if (value.is_nullish())
         stencil = JS::js_undefined();
     else
-        stencil = TRY(value.as_object().get("stencil"));
+        stencil = TRY(value.as_object().get("stencil"_fly_string));
 
     bool stencil_value;
 
diff --git a/Libraries/LibWeb/WebIDL/Promise.cpp b/Libraries/LibWeb/WebIDL/Promise.cpp
index be2143637d9..0b35bff261f 100644
--- a/Libraries/LibWeb/WebIDL/Promise.cpp
+++ b/Libraries/LibWeb/WebIDL/Promise.cpp
@@ -112,7 +112,7 @@ GC::Ref<Promise> react_to_promise(Promise const& promise, GC::Ptr<ReactionSteps>
     };
 
     // 2. Let onFulfilled be CreateBuiltinFunction(onFulfilledSteps, « »):
-    auto on_fulfilled = JS::NativeFunction::create(realm, move(on_fulfilled_steps), 1, "");
+    auto on_fulfilled = JS::NativeFunction::create(realm, move(on_fulfilled_steps), 1);
 
     // 3. Let onRejectedSteps be the following steps given argument R:
     auto on_rejected_steps = [&realm, on_rejected_callback = move(on_rejected_callback)](JS::VM& vm) -> JS::ThrowCompletionOr<JS::Value> {
@@ -129,7 +129,7 @@ GC::Ref<Promise> react_to_promise(Promise const& promise, GC::Ptr<ReactionSteps>
     };
 
     // 4. Let onRejected be CreateBuiltinFunction(onRejectedSteps, « »):
-    auto on_rejected = JS::NativeFunction::create(realm, move(on_rejected_steps), 1, "");
+    auto on_rejected = JS::NativeFunction::create(realm, move(on_rejected_steps), 1);
 
     // 5. Let constructor be promise.[[Promise]].[[Realm]].[[Intrinsics]].[[%Promise%]].
     auto constructor = realm.intrinsics().promise_constructor();
@@ -232,7 +232,7 @@ void wait_for_all(JS::Realm& realm, Vector<GC::Ref<Promise>> const& promises, Fu
     };
 
     // 4. Let rejectionHandler be CreateBuiltinFunction(rejectionHandlerSteps, « »):
-    auto rejection_handler = JS::NativeFunction::create(realm, move(rejection_handler_steps), 1, "");
+    auto rejection_handler = JS::NativeFunction::create(realm, move(rejection_handler_steps), 1);
 
     // 5. Let total be promises’s size.
     auto total = promises.size();
@@ -280,7 +280,7 @@ void wait_for_all(JS::Realm& realm, Vector<GC::Ref<Promise>> const& promises, Fu
         };
 
         // 3. Let fulfillmentHandler be CreateBuiltinFunction(fulfillmentHandler, « »):
-        auto fulfillment_handler = JS::NativeFunction::create(realm, move(fulfillment_handler_steps), 1, "");
+        auto fulfillment_handler = JS::NativeFunction::create(realm, move(fulfillment_handler_steps), 1);
 
         // 4. Perform PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler).
         static_cast<JS::Promise&>(*promise->promise()).perform_then(fulfillment_handler, rejection_handler, nullptr);
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
index 5763a99856a..48b4b275691 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
@@ -929,7 +929,7 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
                 dictionary_generator.append(R"~~~(
     auto @member_property_value_name@ = JS::js_undefined();
     if (@js_name@@js_suffix@.is_object())
-        @member_property_value_name@ = TRY(@js_name@@js_suffix@.as_object().get("@member_key@"));
+        @member_property_value_name@ = TRY(@js_name@@js_suffix@.as_object().get("@member_key@"_fly_string));
 )~~~");
                 if (member.required) {
                     dictionary_generator.append(R"~~~(
@@ -2039,7 +2039,7 @@ static void generate_wrap_statement(SourceGenerator& generator, ByteString const
                 generate_wrap_statement(dictionary_generator, ByteString::formatted("{}{}{}", value, type.is_nullable() ? "->" : ".", member.name.to_snakecase()), member.type, interface, ByteString::formatted("{} =", wrapped_value_name), WrappingReference::No, recursion_depth + 1, is_optional);
 
                 dictionary_generator.append(R"~~~(
-        MUST(dictionary_object@recursion_depth@->create_data_property("@member_key@", @wrapped_value_name@));
+        MUST(dictionary_object@recursion_depth@->create_data_property("@member_key@"_fly_string, @wrapped_value_name@));
 )~~~");
             }
 
@@ -3112,7 +3112,7 @@ static void collect_attribute_values_of_an_inheritance_stack(SourceGenerator& fu
             generate_wrap_statement(attribute_generator, return_value_name, attribute.type, interface_in_chain, ByteString::formatted("auto {}_wrapped =", return_value_name));
 
             attribute_generator.append(R"~~~(
-    MUST(result->create_data_property("@attribute.name@", @attribute.return_value_name@_wrapped));
+    MUST(result->create_data_property("@attribute.name@"_fly_string, @attribute.return_value_name@_wrapped));
 )~~~");
         }
 
@@ -3123,7 +3123,7 @@ static void collect_attribute_values_of_an_inheritance_stack(SourceGenerator& fu
             generate_wrap_statement(constant_generator, constant.value, constant.type, interface_in_chain, ByteString::formatted("auto constant_{}_value =", constant.name));
 
             constant_generator.append(R"~~~(
-    MUST(result->create_data_property("@constant.name@", constant_@constant.name@_value));
+    MUST(result->create_data_property("@constant.name@"_fly_string, constant_@constant.name@_value));
 )~~~");
         }
     }
@@ -3422,7 +3422,7 @@ void @class_name@::initialize(JS::Realm& realm)
             auto fixme_attribute_generator = generator.fork();
             fixme_attribute_generator.set("attribute.name", attribute.name);
             fixme_attribute_generator.append(R"~~~(
-    define_direct_property("@attribute.name@", JS::js_undefined(), default_attributes | JS::Attribute::Unimplemented);
+    define_direct_property("@attribute.name@"_fly_string, JS::js_undefined(), default_attributes | JS::Attribute::Unimplemented);
             )~~~");
             continue;
         }
@@ -3438,12 +3438,12 @@ void @class_name@::initialize(JS::Realm& realm)
 
         if (attribute.extended_attributes.contains("Unscopable")) {
             attribute_generator.append(R"~~~(
-    MUST(unscopable_object->create_data_property("@attribute.name@", JS::Value(true)));
+    MUST(unscopable_object->create_data_property("@attribute.name@"_fly_string, JS::Value(true)));
 )~~~");
         }
 
         attribute_generator.append(R"~~~(
-    define_native_accessor(realm, "@attribute.name@", @attribute.getter_callback@, @attribute.setter_callback@, default_attributes);
+    define_native_accessor(realm, "@attribute.name@"_fly_string, @attribute.getter_callback@, @attribute.setter_callback@, default_attributes);
 )~~~");
     }
 
@@ -3452,7 +3452,7 @@ void @class_name@::initialize(JS::Realm& realm)
             auto fixme_function_generator = generator.fork();
             fixme_function_generator.set("function.name", function.name);
             fixme_function_generator.append(R"~~~(
-        define_direct_property("@function.name@", JS::js_undefined(), default_attributes | JS::Attribute::Unimplemented);
+        define_direct_property("@function.name@"_fly_string, JS::js_undefined(), default_attributes | JS::Attribute::Unimplemented);
             )~~~");
         }
     }
@@ -3467,7 +3467,7 @@ void @class_name@::initialize(JS::Realm& realm)
         generate_wrap_statement(constant_generator, constant.value, constant.type, interface, ByteString::formatted("auto constant_{}_value =", constant.name));
 
         constant_generator.append(R"~~~(
-    define_direct_property("@constant.name@", constant_@constant.name@_value, JS::Attribute::Enumerable);
+    define_direct_property("@constant.name@"_fly_string, constant_@constant.name@_value, JS::Attribute::Enumerable);
 )~~~");
     }
 
@@ -3481,12 +3481,12 @@ void @class_name@::initialize(JS::Realm& realm)
         if (any_of(overload_set.value, [](auto const& function) { return function.extended_attributes.contains("Unscopable"); })) {
             VERIFY(all_of(overload_set.value, [](auto const& function) { return function.extended_attributes.contains("Unscopable"); }));
             function_generator.append(R"~~~(
-    MUST(unscopable_object->create_data_property("@function.name@", JS::Value(true)));
+    MUST(unscopable_object->create_data_property("@function.name@"_fly_string, JS::Value(true)));
 )~~~");
         }
 
         function_generator.append(R"~~~(
-    define_native_function(realm, "@function.name@", @function.name:snakecase@, @function.length@, default_attributes);
+    define_native_function(realm, "@function.name@"_fly_string, @function.name:snakecase@, @function.length@, default_attributes);
 )~~~");
     }
 
@@ -3495,7 +3495,7 @@ void @class_name@::initialize(JS::Realm& realm)
 
         auto stringifier_generator = generator.fork();
         stringifier_generator.append(R"~~~(
-    define_native_function(realm, "toString", to_string, 0, default_attributes);
+    define_native_function(realm, "toString"_fly_string, to_string, 0, default_attributes);
 )~~~");
     }
 
@@ -4142,7 +4142,7 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@attribute.setter_callback@)
     }
 
     if (window) {
-        TRY(window->internal_define_own_property("@attribute.name@", JS::PropertyDescriptor { .value = vm.argument(0), .writable = true }));
+        TRY(window->internal_define_own_property("@attribute.name@"_fly_string, JS::PropertyDescriptor { .value = vm.argument(0), .writable = true }));
         return JS::js_undefined();
     }
 
@@ -4160,7 +4160,7 @@ JS_DEFINE_NATIVE_FUNCTION(@class_name@::@attribute.setter_callback@)
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObjectOfType, "@namespaced_name@");
     if (vm.argument_count() < 1)
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::BadArgCountOne, "@namespaced_name@ setter");
-    TRY(this_value.as_object().internal_define_own_property("@attribute.name@", JS::PropertyDescriptor { .value = vm.argument(0), .writable = true }));
+    TRY(this_value.as_object().internal_define_own_property("@attribute.name@"_fly_string, JS::PropertyDescriptor { .value = vm.argument(0), .writable = true }));
     return JS::js_undefined();
 }
 )~~~");
@@ -4613,7 +4613,7 @@ void @namespace_class@::initialize(JS::Realm& realm)
         function_generator.set("function.length", ByteString::number(get_shortest_function_length(overload_set.value)));
 
         function_generator.append(R"~~~(
-    define_native_function(realm, "@function.name@", @function.name:snakecase@, @function.length@, default_attributes);
+    define_native_function(realm, "@function.name@"_fly_string, @function.name:snakecase@, @function.length@, default_attributes);
 )~~~");
     }
 
@@ -4749,7 +4749,7 @@ static void define_the_operations(SourceGenerator& generator, HashMap<ByteString
             function_generator.set("function.attributes", "JS::Attribute::Writable | JS::Attribute::Enumerable | JS::Attribute::Configurable");
 
         function_generator.append(R"~~~(
-    define_native_function(realm, "@function.name@", @function.name:snakecase@, @function.length@, @function.attributes@);
+    define_native_function(realm, "@function.name@"_fly_string, @function.name:snakecase@, @function.length@, @function.attributes@);
 )~~~");
     }
 }
@@ -4865,7 +4865,7 @@ void @constructor_class@::initialize(JS::Realm& realm)
         generate_wrap_statement(constant_generator, constant.value, constant.type, interface, ByteString::formatted("auto constant_{}_value =", constant.name));
 
         constant_generator.append(R"~~~(
-    define_direct_property("@constant.name@", constant_@constant.name@_value, JS::Attribute::Enumerable);
+    define_direct_property("@constant.name@"_fly_string, constant_@constant.name@_value, JS::Attribute::Enumerable);
 )~~~");
     }
 
@@ -4881,7 +4881,7 @@ void @constructor_class@::initialize(JS::Realm& realm)
             attribute_generator.set("attribute.setter_callback", "nullptr");
 
         attribute_generator.append(R"~~~(
-    define_native_accessor(realm, "@attribute.name@", @attribute.getter_callback@, @attribute.setter_callback@, default_attributes);
+    define_native_accessor(realm, "@attribute.name@"_fly_string, @attribute.getter_callback@, @attribute.setter_callback@, default_attributes);
 )~~~");
     }
 
diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateWindowOrWorkerInterfaces.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateWindowOrWorkerInterfaces.cpp
index f463ebe7bf8..84e9a4d38aa 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateWindowOrWorkerInterfaces.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateWindowOrWorkerInterfaces.cpp
@@ -116,7 +116,7 @@ void Intrinsics::create_web_namespace<@namespace_class@>(JS::Realm& realm)
             gen.set("owned_prototype_class", interface.prototype_class);
 
             gen.append(R"~~~(
-    namespace_object->define_intrinsic_accessor("@owned_interface_name@", attr, [](auto& realm) -> JS::Value { return &Bindings::ensure_web_constructor<@owned_prototype_class@>(realm, "@interface_name@.@owned_interface_name@"_fly_string); });)~~~");
+    namespace_object->define_intrinsic_accessor("@owned_interface_name@"_fly_string, attr, [](auto& realm) -> JS::Value { return &Bindings::ensure_web_constructor<@owned_prototype_class@>(realm, "@interface_name@.@owned_interface_name@"_fly_string); });)~~~");
         }
 
         gen.append(R"~~~(
@@ -267,7 +267,7 @@ void add_@global_object_snake_name@_exposed_interfaces(JS::Object& global)
         gen.set("prototype_class", prototype_class);
 
         gen.append(R"~~~(
-    global.define_intrinsic_accessor("@interface_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
+    global.define_intrinsic_accessor("@interface_name@"_fly_string, attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
 
         // https://webidl.spec.whatwg.org/#LegacyWindowAlias
         if (legacy_alias_name.has_value()) {
@@ -276,19 +276,19 @@ void add_@global_object_snake_name@_exposed_interfaces(JS::Object& global)
                 for (auto legacy_alias_name : legacy_alias_names) {
                     gen.set("interface_alias_name", legacy_alias_name.trim_whitespace());
                     gen.append(R"~~~(
-    global.define_intrinsic_accessor("@interface_alias_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
+    global.define_intrinsic_accessor("@interface_alias_name@"_fly_string, attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
                 }
             } else {
                 gen.set("interface_alias_name", *legacy_alias_name);
                 gen.append(R"~~~(
-    global.define_intrinsic_accessor("@interface_alias_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
+    global.define_intrinsic_accessor("@interface_alias_name@"_fly_string, attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
             }
         }
 
         if (legacy_constructor.has_value()) {
             gen.set("legacy_interface_name", legacy_constructor->name);
             gen.append(R"~~~(
-    global.define_intrinsic_accessor("@legacy_interface_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@legacy_interface_name@"_fly_string); });)~~~");
+    global.define_intrinsic_accessor("@legacy_interface_name@"_fly_string, attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@legacy_interface_name@"_fly_string); });)~~~");
         }
     };
 
@@ -297,7 +297,7 @@ void add_@global_object_snake_name@_exposed_interfaces(JS::Object& global)
         gen.set("namespace_class", namespace_class);
 
         gen.append(R"~~~(
-    global.define_intrinsic_accessor("@interface_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_namespace<@namespace_class@>(realm, "@interface_name@"_fly_string); });)~~~");
+    global.define_intrinsic_accessor("@interface_name@"_fly_string, attr, [](auto& realm) -> JS::Value { return &ensure_web_namespace<@namespace_class@>(realm, "@interface_name@"_fly_string); });)~~~");
     };
 
     for (auto& interface : exposed_interfaces) {
diff --git a/Services/WebContent/ConsoleGlobalEnvironmentExtensions.cpp b/Services/WebContent/ConsoleGlobalEnvironmentExtensions.cpp
index 950b46984b1..f0c485a6398 100644
--- a/Services/WebContent/ConsoleGlobalEnvironmentExtensions.cpp
+++ b/Services/WebContent/ConsoleGlobalEnvironmentExtensions.cpp
@@ -27,10 +27,10 @@ void ConsoleGlobalEnvironmentExtensions::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_native_accessor(realm, "$0", $0_getter, nullptr, 0);
-    define_native_accessor(realm, "$_", $__getter, nullptr, 0);
-    define_native_function(realm, "$", $_function, 2, JS::default_attributes);
-    define_native_function(realm, "$$", $$_function, 2, JS::default_attributes);
+    define_native_accessor(realm, "$0"_fly_string, $0_getter, nullptr, 0);
+    define_native_accessor(realm, "$_"_fly_string, $__getter, nullptr, 0);
+    define_native_function(realm, "$"_fly_string, $_function, 2, JS::default_attributes);
+    define_native_function(realm, "$$"_fly_string, $$_function, 2, JS::default_attributes);
 }
 
 void ConsoleGlobalEnvironmentExtensions::visit_edges(Visitor& visitor)
diff --git a/Tests/LibJS/test262-runner.cpp b/Tests/LibJS/test262-runner.cpp
index 4ca0745ab33..185a01964a7 100644
--- a/Tests/LibJS/test262-runner.cpp
+++ b/Tests/LibJS/test262-runner.cpp
@@ -90,19 +90,19 @@ static ErrorOr<void, TestError> run_program(InterpreterT& interpreter, ScriptOrM
         if (error_value.is_object()) {
             auto& object = error_value.as_object();
 
-            auto name = object.get_without_side_effects("name");
+            auto name = object.get_without_side_effects("name"_fly_string);
             if (!name.is_empty() && !name.is_accessor()) {
                 error.type = name.to_string_without_side_effects();
             } else {
-                auto constructor = object.get_without_side_effects("constructor");
+                auto constructor = object.get_without_side_effects("constructor"_fly_string);
                 if (constructor.is_object()) {
-                    name = constructor.as_object().get_without_side_effects("name");
+                    name = constructor.as_object().get_without_side_effects("name"_fly_string);
                     if (!name.is_undefined())
                         error.type = name.to_string_without_side_effects();
                 }
             }
 
-            auto message = object.get_without_side_effects("message");
+            auto message = object.get_without_side_effects("message"_fly_string);
             if (!message.is_empty() && !message.is_accessor())
                 error.details = message.to_string_without_side_effects();
         }
diff --git a/Tests/LibWasm/test-wasm.cpp b/Tests/LibWasm/test-wasm.cpp
index fe2bfcd36e8..d40c79632a5 100644
--- a/Tests/LibWasm/test-wasm.cpp
+++ b/Tests/LibWasm/test-wasm.cpp
@@ -243,7 +243,7 @@ TESTJS_GLOBAL_FUNCTION(test_simd_vector, testSIMDVector)
     if (!is<JS::TypedArrayBase>(*got))
         return vm.throw_completion<JS::TypeError>("Expected a TypedArray"sv);
     auto& got_array = static_cast<JS::TypedArrayBase&>(*got);
-    auto element_size = 128 / TRY(TRY(expected_array.get("length")).to_u32(vm));
+    auto element_size = 128 / TRY(TRY(expected_array.get("length"_fly_string)).to_u32(vm));
     size_t i = 0;
     for (auto it = expected_array.indexed_properties().begin(false); it != expected_array.indexed_properties().end(); ++it) {
         auto got_value = TRY(got_array.get(i++));
@@ -277,8 +277,8 @@ TESTJS_GLOBAL_FUNCTION(test_simd_vector, testSIMDVector)
 void WebAssemblyModule::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
-    define_native_function(realm, "getExport", get_export, 1, JS::default_attributes);
-    define_native_function(realm, "invoke", wasm_invoke, 1, JS::default_attributes);
+    define_native_function(realm, "getExport"_fly_string, get_export, 1, JS::default_attributes);
+    define_native_function(realm, "invoke"_fly_string, wasm_invoke, 1, JS::default_attributes);
 }
 
 JS_DEFINE_NATIVE_FUNCTION(WebAssemblyModule::get_export)
diff --git a/Utilities/js.cpp b/Utilities/js.cpp
index 494aaafe836..d0fd6a5cdd0 100644
--- a/Utilities/js.cpp
+++ b/Utilities/js.cpp
@@ -323,18 +323,18 @@ void ReplObject::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_direct_property("global", this, JS::Attribute::Enumerable);
+    define_direct_property("global"_fly_string, this, JS::Attribute::Enumerable);
     u8 attr = JS::Attribute::Configurable | JS::Attribute::Writable | JS::Attribute::Enumerable;
-    define_native_function(realm, "exit", exit_interpreter, 0, attr);
-    define_native_function(realm, "help", repl_help, 0, attr);
-    define_native_function(realm, "save", save_to_file, 1, attr);
-    define_native_function(realm, "loadINI", load_ini, 1, attr);
-    define_native_function(realm, "loadJSON", load_json, 1, attr);
-    define_native_function(realm, "print", print, 1, attr);
+    define_native_function(realm, "exit"_fly_string, exit_interpreter, 0, attr);
+    define_native_function(realm, "help"_fly_string, repl_help, 0, attr);
+    define_native_function(realm, "save"_fly_string, save_to_file, 1, attr);
+    define_native_function(realm, "loadINI"_fly_string, load_ini, 1, attr);
+    define_native_function(realm, "loadJSON"_fly_string, load_json, 1, attr);
+    define_native_function(realm, "print"_fly_string, print, 1, attr);
 
     define_native_accessor(
         realm,
-        "_",
+        "_"_fly_string,
         [](JS::VM&) {
             return g_last_value.value();
         },
@@ -410,11 +410,11 @@ void ScriptObject::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
 
-    define_direct_property("global", this, JS::Attribute::Enumerable);
+    define_direct_property("global"_fly_string, this, JS::Attribute::Enumerable);
     u8 attr = JS::Attribute::Configurable | JS::Attribute::Writable | JS::Attribute::Enumerable;
-    define_native_function(realm, "loadINI", load_ini, 1, attr);
-    define_native_function(realm, "loadJSON", load_json, 1, attr);
-    define_native_function(realm, "print", print, 1, attr);
+    define_native_function(realm, "loadINI"_fly_string, load_ini, 1, attr);
+    define_native_function(realm, "loadJSON"_fly_string, load_json, 1, attr);
+    define_native_function(realm, "print"_fly_string, print, 1, attr);
 }
 
 JS_DEFINE_NATIVE_FUNCTION(ScriptObject::load_ini)