LibJS: Set length property in Object::put_native_function()

Author: https://github.com/linusg
Commit: cd3e2690eb
Pull-request: https://github.com/SerenityOS/serenity/pull/1622
Reviewed-by: https://github.com/awesomekling ✅

Libraries/LibJS/Runtime/GlobalObject.cpp

@@ -16,7 +16,7 @@ namespace JS {
 GlobalObject::GlobalObject()
 {
     put_native_function("gc", gc);
-    put_native_function("isNaN", is_nan);
+    put_native_function("isNaN", is_nan, 1);
 
     // FIXME: These are read-only in ES5
     put("NaN", js_nan());