LibJS: Remove Object(Object& prototype) footgun

This constructor was easily confused with a copy constructor, and it was
possible to accidentally copy-construct Objects in at least one way that
we dicovered (via generic ThrowCompletionOr construction).

This patch adds a mandatory ConstructWithPrototypeTag parameter to the
constructor to disambiguate it.

87 files changed, 94 insertions, 93 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/AggregateErrorPrototype.cpp b/Userland/Libraries/LibJS/Runtime/AggregateErrorPrototype.cpp
index 370c9d6569..033099d8ec 100644
--- a/Userland/Libraries/LibJS/Runtime/AggregateErrorPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/AggregateErrorPrototype.cpp
@@ -11,7 +11,7 @@
 namespace JS {
 
 AggregateErrorPrototype::AggregateErrorPrototype(Realm& realm)
-    : Object(*realm.intrinsics().error_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().error_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/ArgumentsObject.cpp b/Userland/Libraries/LibJS/Runtime/ArgumentsObject.cpp
index ffc05bf542..e5e8179958 100644
--- a/Userland/Libraries/LibJS/Runtime/ArgumentsObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ArgumentsObject.cpp
@@ -11,7 +11,7 @@
 namespace JS {
 
 ArgumentsObject::ArgumentsObject(Realm& realm, Environment& environment)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     , m_environment(environment)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Array.cpp b/Userland/Libraries/LibJS/Runtime/Array.cpp
index 1d89d4f8d7..3a8c6ae8fe 100644
--- a/Userland/Libraries/LibJS/Runtime/Array.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Array.cpp
@@ -61,7 +61,7 @@ NonnullGCPtr<Array> Array::create_from(Realm& realm, Vector<Value> const& elemen
 }
 
 Array::Array(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp b/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp
index 77394e8a2c..772fc285ce 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ArrayBuffer.cpp
@@ -31,14 +31,14 @@ NonnullGCPtr<ArrayBuffer> ArrayBuffer::create(Realm& realm, ByteBuffer* buffer)
 }
 
 ArrayBuffer::ArrayBuffer(ByteBuffer buffer, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_buffer(move(buffer))
     , m_detach_key(js_undefined())
 {
 }
 
 ArrayBuffer::ArrayBuffer(ByteBuffer* buffer, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_buffer(buffer)
     , m_detach_key(js_undefined())
 {
diff --git a/Userland/Libraries/LibJS/Runtime/ArrayIterator.cpp b/Userland/Libraries/LibJS/Runtime/ArrayIterator.cpp
index 39d428d412..eca16e4108 100644
--- a/Userland/Libraries/LibJS/Runtime/ArrayIterator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ArrayIterator.cpp
@@ -15,7 +15,7 @@ NonnullGCPtr<ArrayIterator> ArrayIterator::create(Realm& realm, Value array, Obj
 }
 
 ArrayIterator::ArrayIterator(Value array, Object::PropertyKind iteration_kind, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_array(array)
     , m_iteration_kind(iteration_kind)
 {
diff --git a/Userland/Libraries/LibJS/Runtime/AsyncFromSyncIterator.cpp b/Userland/Libraries/LibJS/Runtime/AsyncFromSyncIterator.cpp
index 7e02af21a1..9459ccc1d2 100644
--- a/Userland/Libraries/LibJS/Runtime/AsyncFromSyncIterator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/AsyncFromSyncIterator.cpp
@@ -17,7 +17,7 @@ NonnullGCPtr<AsyncFromSyncIterator> AsyncFromSyncIterator::create(Realm& realm,
 }
 
 AsyncFromSyncIterator::AsyncFromSyncIterator(Realm& realm, Iterator sync_iterator_record)
-    : Object(*realm.intrinsics().async_from_sync_iterator_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().async_from_sync_iterator_prototype())
     , m_sync_iterator_record(sync_iterator_record)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/AsyncFunctionPrototype.cpp b/Userland/Libraries/LibJS/Runtime/AsyncFunctionPrototype.cpp
index 55f42d0dd1..fab88a66ec 100644
--- a/Userland/Libraries/LibJS/Runtime/AsyncFunctionPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/AsyncFunctionPrototype.cpp
@@ -10,7 +10,7 @@
 namespace JS {
 
 AsyncFunctionPrototype::AsyncFunctionPrototype(Realm& realm)
-    : Object(*realm.intrinsics().function_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().function_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/AsyncGenerator.cpp b/Userland/Libraries/LibJS/Runtime/AsyncGenerator.cpp
index 6ead23830c..20c023afda 100644
--- a/Userland/Libraries/LibJS/Runtime/AsyncGenerator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/AsyncGenerator.cpp
@@ -12,7 +12,7 @@
 namespace JS {
 
 AsyncGenerator::AsyncGenerator(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/AsyncIteratorPrototype.cpp b/Userland/Libraries/LibJS/Runtime/AsyncIteratorPrototype.cpp
index 9ec5c2608d..bcfa3a948f 100644
--- a/Userland/Libraries/LibJS/Runtime/AsyncIteratorPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/AsyncIteratorPrototype.cpp
@@ -9,7 +9,7 @@
 namespace JS {
 
 AsyncIteratorPrototype::AsyncIteratorPrototype(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/AtomicsObject.cpp b/Userland/Libraries/LibJS/Runtime/AtomicsObject.cpp
index 19753f3313..5003171358 100644
--- a/Userland/Libraries/LibJS/Runtime/AtomicsObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/AtomicsObject.cpp
@@ -125,7 +125,7 @@ static ThrowCompletionOr<Value> perform_atomic_operation(VM& vm, TypedArrayBase&
 }
 
 AtomicsObject::AtomicsObject(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/BigIntObject.cpp b/Userland/Libraries/LibJS/Runtime/BigIntObject.cpp
index fcba8c987f..686f790200 100644
--- a/Userland/Libraries/LibJS/Runtime/BigIntObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/BigIntObject.cpp
@@ -15,7 +15,7 @@ NonnullGCPtr<BigIntObject> BigIntObject::create(Realm& realm, BigInt& bigint)
 }
 
 BigIntObject::BigIntObject(BigInt& bigint, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_bigint(bigint)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/BigIntPrototype.cpp b/Userland/Libraries/LibJS/Runtime/BigIntPrototype.cpp
index 23654ac87c..c1884f704b 100644
--- a/Userland/Libraries/LibJS/Runtime/BigIntPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/BigIntPrototype.cpp
@@ -18,7 +18,7 @@
 namespace JS {
 
 BigIntPrototype::BigIntPrototype(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/BooleanObject.cpp b/Userland/Libraries/LibJS/Runtime/BooleanObject.cpp
index ec8b9a16d9..21decbc74b 100644
--- a/Userland/Libraries/LibJS/Runtime/BooleanObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/BooleanObject.cpp
@@ -15,7 +15,7 @@ NonnullGCPtr<BooleanObject> BooleanObject::create(Realm& realm, bool value)
 }
 
 BooleanObject::BooleanObject(bool value, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_value(value)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/ConsoleObject.cpp b/Userland/Libraries/LibJS/Runtime/ConsoleObject.cpp
index 1d17f2a7eb..a9e56d2adb 100644
--- a/Userland/Libraries/LibJS/Runtime/ConsoleObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ConsoleObject.cpp
@@ -13,7 +13,7 @@
 namespace JS {
 
 ConsoleObject::ConsoleObject(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     , m_console(make<Console>(realm))
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/DataView.cpp b/Userland/Libraries/LibJS/Runtime/DataView.cpp
index 050a863e91..bf4ac73680 100644
--- a/Userland/Libraries/LibJS/Runtime/DataView.cpp
+++ b/Userland/Libraries/LibJS/Runtime/DataView.cpp
@@ -14,7 +14,7 @@ NonnullGCPtr<DataView> DataView::create(Realm& realm, ArrayBuffer* viewed_buffer
 }
 
 DataView::DataView(ArrayBuffer* viewed_buffer, size_t byte_length, size_t byte_offset, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_viewed_array_buffer(viewed_buffer)
     , m_byte_length(byte_length)
     , m_byte_offset(byte_offset)
diff --git a/Userland/Libraries/LibJS/Runtime/Date.cpp b/Userland/Libraries/LibJS/Runtime/Date.cpp
index 3bd4596e4e..0c553da8ac 100644
--- a/Userland/Libraries/LibJS/Runtime/Date.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Date.cpp
@@ -27,7 +27,7 @@ NonnullGCPtr<Date> Date::create(Realm& realm, double date_value)
 }
 
 Date::Date(double date_value, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_date_value(date_value)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp b/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
index 04c6e90766..e9ca728072 100644
--- a/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
@@ -208,7 +208,7 @@ ThrowCompletionOr<Object*> ECMAScriptFunctionObject::internal_construct(MarkedVe
     // 3. If kind is base, then
     if (kind == ConstructorKind::Base) {
         // a. Let thisArgument be ? OrdinaryCreateFromConstructor(newTarget, "%Object.prototype%").
-        this_argument = TRY(ordinary_create_from_constructor<Object>(vm, new_target, &Intrinsics::object_prototype));
+        this_argument = TRY(ordinary_create_from_constructor<Object>(vm, new_target, &Intrinsics::object_prototype, ConstructWithPrototypeTag::Tag));
     }
 
     ExecutionContext callee_context(heap());
diff --git a/Userland/Libraries/LibJS/Runtime/Error.cpp b/Userland/Libraries/LibJS/Runtime/Error.cpp
index c5052d6cca..ca3960899a 100644
--- a/Userland/Libraries/LibJS/Runtime/Error.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Error.cpp
@@ -29,7 +29,7 @@ NonnullGCPtr<Error> Error::create(Realm& realm, DeprecatedString const& message)
 }
 
 Error::Error(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
     populate_stack();
 }
diff --git a/Userland/Libraries/LibJS/Runtime/FinalizationRegistry.cpp b/Userland/Libraries/LibJS/Runtime/FinalizationRegistry.cpp
index a11ba51d45..3ba8e98d1d 100644
--- a/Userland/Libraries/LibJS/Runtime/FinalizationRegistry.cpp
+++ b/Userland/Libraries/LibJS/Runtime/FinalizationRegistry.cpp
@@ -10,7 +10,7 @@
 namespace JS {
 
 FinalizationRegistry::FinalizationRegistry(Realm& realm, JobCallback cleanup_callback, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , WeakContainer(heap())
     , m_realm(realm)
     , m_cleanup_callback(move(cleanup_callback))
diff --git a/Userland/Libraries/LibJS/Runtime/FunctionObject.cpp b/Userland/Libraries/LibJS/Runtime/FunctionObject.cpp
index 1552634b76..03a4f6527f 100644
--- a/Userland/Libraries/LibJS/Runtime/FunctionObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/FunctionObject.cpp
@@ -19,7 +19,7 @@ FunctionObject::FunctionObject(Realm& realm, Object* prototype)
 }
 
 FunctionObject::FunctionObject(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/GeneratorFunctionPrototype.cpp b/Userland/Libraries/LibJS/Runtime/GeneratorFunctionPrototype.cpp
index 3343ca3ad2..47a7668c4b 100644
--- a/Userland/Libraries/LibJS/Runtime/GeneratorFunctionPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/GeneratorFunctionPrototype.cpp
@@ -11,7 +11,7 @@
 namespace JS {
 
 GeneratorFunctionPrototype::GeneratorFunctionPrototype(Realm& realm)
-    : Object(*realm.intrinsics().function_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().function_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/GeneratorObject.cpp b/Userland/Libraries/LibJS/Runtime/GeneratorObject.cpp
index 0daf443ce4..206ecc2597 100644
--- a/Userland/Libraries/LibJS/Runtime/GeneratorObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/GeneratorObject.cpp
@@ -36,7 +36,7 @@ ThrowCompletionOr<NonnullGCPtr<GeneratorObject>> GeneratorObject::create(Realm&
 }
 
 GeneratorObject::GeneratorObject(Realm&, Object& prototype, ExecutionContext context)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_execution_context(move(context))
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/Collator.cpp b/Userland/Libraries/LibJS/Runtime/Intl/Collator.cpp
index b705d4adc5..fa2355888d 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/Collator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/Collator.cpp
@@ -10,7 +10,7 @@ namespace JS::Intl {
 
 // 10 Collator Objects, https://tc39.es/ecma402/#collator-objects
 Collator::Collator(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp b/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp
index 2df15f9d70..7fe44e48ff 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/DateTimeFormat.cpp
@@ -26,7 +26,7 @@ static Crypto::SignedBigInteger const s_one_million_bigint { 1'000'000 };
 
 // 11 DateTimeFormat Objects, https://tc39.es/ecma402/#datetimeformat-objects
 DateTimeFormat::DateTimeFormat(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/DisplayNames.cpp b/Userland/Libraries/LibJS/Runtime/Intl/DisplayNames.cpp
index 3d5358d1ae..f928d527ae 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/DisplayNames.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/DisplayNames.cpp
@@ -12,7 +12,7 @@ namespace JS::Intl {
 
 // 12 DisplayNames Objects, https://tc39.es/ecma402/#intl-displaynames-objects
 DisplayNames::DisplayNames(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/DurationFormat.cpp b/Userland/Libraries/LibJS/Runtime/Intl/DurationFormat.cpp
index 8afbfd61cc..9b555a7046 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/DurationFormat.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/DurationFormat.cpp
@@ -20,7 +20,7 @@ namespace JS::Intl {
 
 // 1 DurationFormat Objects, https://tc39.es/proposal-intl-duration-format/#durationformat-objects
 DurationFormat::DurationFormat(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/Intl.cpp b/Userland/Libraries/LibJS/Runtime/Intl/Intl.cpp
index a9ba5d3526..b9787f157e 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/Intl.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/Intl.cpp
@@ -28,7 +28,7 @@ namespace JS::Intl {
 
 // 8 The Intl Object, https://tc39.es/ecma402/#intl-object
 Intl::Intl(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/ListFormat.cpp b/Userland/Libraries/LibJS/Runtime/Intl/ListFormat.cpp
index c594789e1d..8958b44112 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/ListFormat.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/ListFormat.cpp
@@ -14,7 +14,7 @@ namespace JS::Intl {
 
 // 13 ListFormat Objects, https://tc39.es/ecma402/#listformat-objects
 ListFormat::ListFormat(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/Locale.cpp b/Userland/Libraries/LibJS/Runtime/Intl/Locale.cpp
index 4256d0d683..3907cbf695 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/Locale.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/Locale.cpp
@@ -21,12 +21,12 @@ NonnullGCPtr<Locale> Locale::create(Realm& realm, ::Locale::LocaleID const& loca
 
 // 14 Locale Objects, https://tc39.es/ecma402/#locale-objects
 Locale::Locale(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
 Locale::Locale(::Locale::LocaleID const& locale_id, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
     set_locale(locale_id.to_deprecated_string());
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp
index a5ea933c86..0a0ee0d7f6 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp
@@ -21,7 +21,7 @@
 namespace JS::Intl {
 
 NumberFormatBase::NumberFormatBase(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormat.cpp b/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormat.cpp
index 5fd2251b4c..1dce1620b0 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormat.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormat.cpp
@@ -17,7 +17,7 @@ namespace JS::Intl {
 
 // 17 RelativeTimeFormat Objects, https://tc39.es/ecma402/#relativetimeformat-objects
 RelativeTimeFormat::RelativeTimeFormat(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/SegmentIterator.cpp b/Userland/Libraries/LibJS/Runtime/Intl/SegmentIterator.cpp
index cf55a25f9e..0fbdf3c6d8 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/SegmentIterator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/SegmentIterator.cpp
@@ -24,7 +24,7 @@ NonnullGCPtr<SegmentIterator> SegmentIterator::create(Realm& realm, Segmenter& s
 
 // 18.6 Segment Iterator Objects, https://tc39.es/ecma402/#sec-segment-iterator-objects
 SegmentIterator::SegmentIterator(Realm& realm, Segmenter& segmenter, Utf16View const& string, Segments const& segments)
-    : Object(*realm.intrinsics().intl_segment_iterator_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().intl_segment_iterator_prototype())
     , m_iterating_segmenter(segmenter)
     , m_iterated_string(string)
     , m_segments(segments)
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/Segmenter.cpp b/Userland/Libraries/LibJS/Runtime/Intl/Segmenter.cpp
index 1b3f63316c..d79be00a23 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/Segmenter.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/Segmenter.cpp
@@ -14,7 +14,7 @@ namespace JS::Intl {
 
 // 18 Segmenter Objects, https://tc39.es/ecma402/#segmenter-objects
 Segmenter::Segmenter(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/Segments.cpp b/Userland/Libraries/LibJS/Runtime/Intl/Segments.cpp
index 57b0ffecc6..2572fcf6d7 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/Segments.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/Segments.cpp
@@ -23,7 +23,7 @@ NonnullGCPtr<Segments> Segments::create(Realm& realm, Segmenter& segmenter, Utf1
 
 // 18.5 Segments Objects, https://tc39.es/ecma402/#sec-segments-objects
 Segments::Segments(Realm& realm, Segmenter& segmenter, Utf16String string)
-    : Object(*realm.intrinsics().intl_segments_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().intl_segments_prototype())
     , m_segments_segmenter(segmenter)
     , m_segments_string(move(string))
 {
diff --git a/Userland/Libraries/LibJS/Runtime/IteratorPrototype.cpp b/Userland/Libraries/LibJS/Runtime/IteratorPrototype.cpp
index 177c714961..914eda870c 100644
--- a/Userland/Libraries/LibJS/Runtime/IteratorPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/IteratorPrototype.cpp
@@ -12,7 +12,7 @@ namespace JS {
 
 // 27.1.2 The %IteratorPrototype% Object, https://tc39.es/ecma262/#sec-%iteratorprototype%-object
 IteratorPrototype::IteratorPrototype(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/JSONObject.cpp b/Userland/Libraries/LibJS/Runtime/JSONObject.cpp
index d70d0ebaf0..5698a819f1 100644
--- a/Userland/Libraries/LibJS/Runtime/JSONObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/JSONObject.cpp
@@ -27,7 +27,7 @@
 namespace JS {
 
 JSONObject::JSONObject(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Map.cpp b/Userland/Libraries/LibJS/Runtime/Map.cpp
index 87fc6edbc7..e65dde2e04 100644
--- a/Userland/Libraries/LibJS/Runtime/Map.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Map.cpp
@@ -14,7 +14,7 @@ NonnullGCPtr<Map> Map::create(Realm& realm)
 }
 
 Map::Map(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/MapIterator.cpp b/Userland/Libraries/LibJS/Runtime/MapIterator.cpp
index 3ac21cfb64..7685bcee82 100644
--- a/Userland/Libraries/LibJS/Runtime/MapIterator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/MapIterator.cpp
@@ -15,7 +15,7 @@ NonnullGCPtr<MapIterator> MapIterator::create(Realm& realm, Map& map, Object::Pr
 }
 
 MapIterator::MapIterator(Map& map, Object::PropertyKind iteration_kind, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_map(map)
     , m_iteration_kind(iteration_kind)
     , m_iterator(static_cast<Map const&>(map).begin())
diff --git a/Userland/Libraries/LibJS/Runtime/MathObject.cpp b/Userland/Libraries/LibJS/Runtime/MathObject.cpp
index 33aa0670d2..8c537bcc92 100644
--- a/Userland/Libraries/LibJS/Runtime/MathObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/MathObject.cpp
@@ -16,7 +16,7 @@
 namespace JS {
 
 MathObject::MathObject(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/ModuleNamespaceObject.cpp b/Userland/Libraries/LibJS/Runtime/ModuleNamespaceObject.cpp
index c41a2ee49e..9924473049 100644
--- a/Userland/Libraries/LibJS/Runtime/ModuleNamespaceObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ModuleNamespaceObject.cpp
@@ -11,7 +11,7 @@
 namespace JS {
 
 ModuleNamespaceObject::ModuleNamespaceObject(Realm& realm, Module* module, Vector<FlyString> exports)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     , m_module(module)
     , m_exports(move(exports))
 {
diff --git a/Userland/Libraries/LibJS/Runtime/NumberObject.cpp b/Userland/Libraries/LibJS/Runtime/NumberObject.cpp
index 200e1d4265..0086a454ae 100644
--- a/Userland/Libraries/LibJS/Runtime/NumberObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/NumberObject.cpp
@@ -15,7 +15,7 @@ NonnullGCPtr<NumberObject> NumberObject::create(Realm& realm, double value)
 }
 
 NumberObject::NumberObject(double value, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_value(value)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Object.cpp b/Userland/Libraries/LibJS/Runtime/Object.cpp
index 4a614120d2..1de34675ba 100644
--- a/Userland/Libraries/LibJS/Runtime/Object.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Object.cpp
@@ -34,7 +34,7 @@ NonnullGCPtr<Object> Object::create(Realm& realm, Object* prototype)
     else if (prototype == realm.intrinsics().object_prototype())
         return *realm.heap().allocate<Object>(realm, *realm.intrinsics().new_object_shape());
     else
-        return *realm.heap().allocate<Object>(realm, *prototype);
+        return *realm.heap().allocate<Object>(realm, ConstructWithPrototypeTag::Tag, *prototype);
 }
 
 Object::Object(GlobalObjectTag, Realm& realm)
@@ -56,7 +56,7 @@ Object::Object(Realm& realm, Object* prototype)
         set_prototype(prototype);
 }
 
-Object::Object(Object& prototype)
+Object::Object(ConstructWithPrototypeTag, Object& prototype)
 {
     m_shape = prototype.shape().realm().intrinsics().empty_object_shape();
     VERIFY(m_shape);
diff --git a/Userland/Libraries/LibJS/Runtime/Object.h b/Userland/Libraries/LibJS/Runtime/Object.h
index de134670b3..5cabe99c4b 100644
--- a/Userland/Libraries/LibJS/Runtime/Object.h
+++ b/Userland/Libraries/LibJS/Runtime/Object.h
@@ -191,11 +191,12 @@ public:
 protected:
     enum class GlobalObjectTag { Tag };
     enum class ConstructWithoutPrototypeTag { Tag };
+    enum class ConstructWithPrototypeTag { Tag };
 
     Object(GlobalObjectTag, Realm&);
     Object(ConstructWithoutPrototypeTag, Realm&);
     Object(Realm&, Object* prototype);
-    explicit Object(Object& prototype);
+    Object(ConstructWithPrototypeTag, Object& prototype);
     explicit Object(Shape&);
 
     void set_prototype(Object*);
diff --git a/Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp b/Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp
index 0dbc849867..779aa16639 100644
--- a/Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp
@@ -70,7 +70,7 @@ ThrowCompletionOr<Object*> ObjectConstructor::construct(FunctionObject& new_targ
     auto& realm = *vm.current_realm();
 
     if (&new_target != this)
-        return TRY(ordinary_create_from_constructor<Object>(vm, new_target, &Intrinsics::object_prototype));
+        return TRY(ordinary_create_from_constructor<Object>(vm, new_target, &Intrinsics::object_prototype, ConstructWithPrototypeTag::Tag));
     auto value = vm.argument(0);
     if (value.is_nullish())
         return Object::create(realm, realm.intrinsics().object_prototype()).ptr();
diff --git a/Userland/Libraries/LibJS/Runtime/Promise.cpp b/Userland/Libraries/LibJS/Runtime/Promise.cpp
index cc01bef99e..658fe85a33 100644
--- a/Userland/Libraries/LibJS/Runtime/Promise.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Promise.cpp
@@ -49,7 +49,7 @@ NonnullGCPtr<Promise> Promise::create(Realm& realm)
 
 // 27.2 Promise Objects, https://tc39.es/ecma262/#sec-promise-objects
 Promise::Promise(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/PrototypeObject.h b/Userland/Libraries/LibJS/Runtime/PrototypeObject.h
index cada17fb4d..35c5a95cc0 100644
--- a/Userland/Libraries/LibJS/Runtime/PrototypeObject.h
+++ b/Userland/Libraries/LibJS/Runtime/PrototypeObject.h
@@ -57,7 +57,7 @@ public:
 
 protected:
     explicit PrototypeObject(Object& prototype)
-        : Object(prototype)
+        : Object(ConstructWithPrototypeTag::Tag, prototype)
     {
     }
 };
diff --git a/Userland/Libraries/LibJS/Runtime/ReflectObject.cpp b/Userland/Libraries/LibJS/Runtime/ReflectObject.cpp
index 2c679de90d..6134c40fa5 100644
--- a/Userland/Libraries/LibJS/Runtime/ReflectObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ReflectObject.cpp
@@ -16,7 +16,7 @@
 namespace JS {
 
 ReflectObject::ReflectObject(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/RegExpObject.cpp b/Userland/Libraries/LibJS/Runtime/RegExpObject.cpp
index 3cf1a687d4..7c0f49e25a 100644
--- a/Userland/Libraries/LibJS/Runtime/RegExpObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/RegExpObject.cpp
@@ -135,12 +135,12 @@ NonnullGCPtr<RegExpObject> RegExpObject::create(Realm& realm, Regex<ECMA262> reg
 }
 
 RegExpObject::RegExpObject(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
 RegExpObject::RegExpObject(Regex<ECMA262> regex, DeprecatedString pattern, DeprecatedString flags, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_pattern(move(pattern))
     , m_flags(move(flags))
     , m_regex(move(regex))
diff --git a/Userland/Libraries/LibJS/Runtime/RegExpStringIterator.cpp b/Userland/Libraries/LibJS/Runtime/RegExpStringIterator.cpp
index 9d78648952..284462e69f 100644
--- a/Userland/Libraries/LibJS/Runtime/RegExpStringIterator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/RegExpStringIterator.cpp
@@ -16,7 +16,7 @@ NonnullGCPtr<RegExpStringIterator> RegExpStringIterator::create(Realm& realm, Ob
 }
 
 RegExpStringIterator::RegExpStringIterator(Object& prototype, Object& regexp_object, Utf16String string, bool global, bool unicode)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_regexp_object(regexp_object)
     , m_string(move(string))
     , m_global(global)
diff --git a/Userland/Libraries/LibJS/Runtime/Set.cpp b/Userland/Libraries/LibJS/Runtime/Set.cpp
index 652c24a2e1..9a6dec409b 100644
--- a/Userland/Libraries/LibJS/Runtime/Set.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Set.cpp
@@ -14,7 +14,7 @@ NonnullGCPtr<Set> Set::create(Realm& realm)
 }
 
 Set::Set(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/SetIterator.cpp b/Userland/Libraries/LibJS/Runtime/SetIterator.cpp
index 5e4b946e98..c951e67d5b 100644
--- a/Userland/Libraries/LibJS/Runtime/SetIterator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/SetIterator.cpp
@@ -15,7 +15,7 @@ NonnullGCPtr<SetIterator> SetIterator::create(Realm& realm, Set& set, Object::Pr
 }
 
 SetIterator::SetIterator(Set& set, Object::PropertyKind iteration_kind, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_set(set)
     , m_iteration_kind(iteration_kind)
     , m_iterator(static_cast<Set const&>(set).begin())
diff --git a/Userland/Libraries/LibJS/Runtime/ShadowRealm.cpp b/Userland/Libraries/LibJS/Runtime/ShadowRealm.cpp
index fcf1943506..05c9e0035e 100644
--- a/Userland/Libraries/LibJS/Runtime/ShadowRealm.cpp
+++ b/Userland/Libraries/LibJS/Runtime/ShadowRealm.cpp
@@ -20,7 +20,7 @@
 namespace JS {
 
 ShadowRealm::ShadowRealm(Realm& shadow_realm, ExecutionContext execution_context, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_shadow_realm(shadow_realm)
     , m_execution_context(move(execution_context))
 {
diff --git a/Userland/Libraries/LibJS/Runtime/StringIterator.cpp b/Userland/Libraries/LibJS/Runtime/StringIterator.cpp
index 0dac262bb1..6d8255976d 100644
--- a/Userland/Libraries/LibJS/Runtime/StringIterator.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringIterator.cpp
@@ -16,7 +16,7 @@ NonnullGCPtr<StringIterator> StringIterator::create(Realm& realm, DeprecatedStri
 }
 
 StringIterator::StringIterator(DeprecatedString string, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_string(move(string))
     , m_iterator(Utf8View(m_string).begin())
 {
diff --git a/Userland/Libraries/LibJS/Runtime/StringObject.cpp b/Userland/Libraries/LibJS/Runtime/StringObject.cpp
index 9ac059d875..1c451d7446 100644
--- a/Userland/Libraries/LibJS/Runtime/StringObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringObject.cpp
@@ -21,7 +21,7 @@ NonnullGCPtr<StringObject> StringObject::create(Realm& realm, PrimitiveString& p
 }
 
 StringObject::StringObject(PrimitiveString& string, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_string(string)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/SymbolObject.cpp b/Userland/Libraries/LibJS/Runtime/SymbolObject.cpp
index cfd637561a..8426020955 100644
--- a/Userland/Libraries/LibJS/Runtime/SymbolObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/SymbolObject.cpp
@@ -16,7 +16,7 @@ NonnullGCPtr<SymbolObject> SymbolObject::create(Realm& realm, Symbol& primitive_
 }
 
 SymbolObject::SymbolObject(Symbol& symbol, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_symbol(symbol)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/SymbolPrototype.cpp b/Userland/Libraries/LibJS/Runtime/SymbolPrototype.cpp
index a2550d85eb..0f9e555a92 100644
--- a/Userland/Libraries/LibJS/Runtime/SymbolPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/SymbolPrototype.cpp
@@ -19,7 +19,7 @@
 namespace JS {
 
 SymbolPrototype::SymbolPrototype(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
index e44f435aa6..c4ed4b55da 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp
@@ -28,7 +28,7 @@ namespace JS::Temporal {
 
 // 12 Temporal.Calendar Objects, https://tc39.es/proposal-temporal/#sec-temporal-calendar-objects
 Calendar::Calendar(DeprecatedString identifier, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_identifier(move(identifier))
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
index 5573fe3c60..fb211a2d6c 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Duration.cpp
@@ -24,7 +24,7 @@ namespace JS::Temporal {
 
 // 7 Temporal.Duration Objects, https://tc39.es/proposal-temporal/#sec-temporal-duration-objects
 Duration::Duration(double years, double months, double weeks, double days, double hours, double minutes, double seconds, double milliseconds, double microseconds, double nanoseconds, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_years(years)
     , m_months(months)
     , m_weeks(weeks)
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
index 534a8c84d1..dff5500db8 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
@@ -24,7 +24,7 @@ namespace JS::Temporal {
 
 // 8 Temporal.Instant Objects, https://tc39.es/proposal-temporal/#sec-temporal-instant-objects
 Instant::Instant(BigInt const& nanoseconds, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_nanoseconds(nanoseconds)
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Now.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Now.cpp
index 2602079f20..3e0b5af636 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Now.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Now.cpp
@@ -22,7 +22,7 @@ namespace JS::Temporal {
 
 // 2 The Temporal.Now Object, https://tc39.es/proposal-temporal/#sec-temporal-now-object
 Now::Now(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
index d13b934fd1..7d20d7d91d 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
@@ -24,7 +24,7 @@ namespace JS::Temporal {
 
 // 3 Temporal.PlainDate Objects, https://tc39.es/proposal-temporal/#sec-temporal-plaindate-objects
 PlainDate::PlainDate(i32 year, u8 month, u8 day, Object& calendar, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_iso_year(year)
     , m_iso_month(month)
     , m_iso_day(day)
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp
index fc5771ddf8..dc1249b49c 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTime.cpp
@@ -25,7 +25,7 @@ namespace JS::Temporal {
 
 // 5 Temporal.PlainDateTime Objects, https://tc39.es/proposal-temporal/#sec-temporal-plaindatetime-objects
 PlainDateTime::PlainDateTime(i32 iso_year, u8 iso_month, u8 iso_day, u8 iso_hour, u8 iso_minute, u8 iso_second, u16 iso_millisecond, u16 iso_microsecond, u16 iso_nanosecond, Object& calendar, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_iso_year(iso_year)
     , m_iso_month(iso_month)
     , m_iso_day(iso_day)
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainMonthDay.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainMonthDay.cpp
index 68f7e2adfb..fce9dc46e5 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainMonthDay.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainMonthDay.cpp
@@ -20,7 +20,7 @@ namespace JS::Temporal {
 
 // 10 Temporal.PlainMonthDay Objects, https://tc39.es/proposal-temporal/#sec-temporal-plainmonthday-objects
 PlainMonthDay::PlainMonthDay(u8 iso_month, u8 iso_day, i32 iso_year, Object& calendar, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_iso_year(iso_year)
     , m_iso_month(iso_month)
     , m_iso_day(iso_day)
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTime.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTime.cpp
index fa3ca3ab30..9bd34f226d 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTime.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTime.cpp
@@ -24,7 +24,7 @@ namespace JS::Temporal {
 
 // 4 Temporal.PlainTime Objects, https://tc39.es/proposal-temporal/#sec-temporal-plaintime-objects
 PlainTime::PlainTime(u8 iso_hour, u8 iso_minute, u8 iso_second, u16 iso_millisecond, u16 iso_microsecond, u16 iso_nanosecond, Calendar& calendar, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_iso_hour(iso_hour)
     , m_iso_minute(iso_minute)
     , m_iso_second(iso_second)
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp
index 5c10f92938..c0f89530c9 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainYearMonth.cpp
@@ -19,7 +19,7 @@ namespace JS::Temporal {
 
 // 9 Temporal.PlainYearMonth Objects, https://tc39.es/proposal-temporal/#sec-temporal-plainyearmonth-objects
 PlainYearMonth::PlainYearMonth(i32 iso_year, u8 iso_month, u8 iso_day, Object& calendar, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_iso_year(iso_year)
     , m_iso_month(iso_month)
     , m_iso_day(iso_day)
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp
index 5d22c434f2..75c468d8b2 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Temporal.cpp
@@ -22,7 +22,7 @@ namespace JS::Temporal {
 
 // 1 The Temporal Object, https://tc39.es/proposal-temporal/#sec-temporal-objects
 Temporal::Temporal(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp
index cfc480264b..7d2878a93f 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.cpp
@@ -25,7 +25,7 @@ namespace JS::Temporal {
 
 // 11 Temporal.TimeZone Objects, https://tc39.es/proposal-temporal/#sec-temporal-timezone-objects
 TimeZone::TimeZone(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
index 9f752e5f84..c67470cf57 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp
@@ -22,7 +22,7 @@ namespace JS::Temporal {
 
 // 6 Temporal.ZonedDateTime Objects, https://tc39.es/proposal-temporal/#sec-temporal-zoneddatetime-objects
 ZonedDateTime::ZonedDateTime(BigInt const& nanoseconds, Object& time_zone, Object& calendar, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , m_nanoseconds(nanoseconds)
     , m_time_zone(time_zone)
     , m_calendar(calendar)
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArray.cpp b/Userland/Libraries/LibJS/Runtime/TypedArray.cpp
index 84ed2757a6..42746970de 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArray.cpp
+++ b/Userland/Libraries/LibJS/Runtime/TypedArray.cpp
@@ -459,7 +459,7 @@ void TypedArrayBase::visit_edges(Visitor& visitor)
     }                                                                                                                            \
                                                                                                                                  \
     PrototypeName::PrototypeName(Object& prototype)                                                                              \
-        : Object(prototype)                                                                                                      \
+        : Object(ConstructWithPrototypeTag::Tag, prototype)                                                                      \
     {                                                                                                                            \
     }                                                                                                                            \
                                                                                                                                  \
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArray.h b/Userland/Libraries/LibJS/Runtime/TypedArray.h
index 9993b6f5e8..e879f2e3b4 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArray.h
+++ b/Userland/Libraries/LibJS/Runtime/TypedArray.h
@@ -62,7 +62,7 @@ public:
 
 protected:
     TypedArrayBase(Object& prototype, IntrinsicConstructor intrinsic_constructor)
-        : Object(prototype)
+        : Object(ConstructWithPrototypeTag::Tag, prototype)
         , m_intrinsic_constructor(intrinsic_constructor)
     {
     }
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
index d6bff2e42e..47f86f8d87 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
@@ -17,7 +17,7 @@
 namespace JS {
 
 TypedArrayPrototype::TypedArrayPrototype(Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibJS/Runtime/WeakMap.cpp b/Userland/Libraries/LibJS/Runtime/WeakMap.cpp
index f4e52c0cc8..eb5e0bd906 100644
--- a/Userland/Libraries/LibJS/Runtime/WeakMap.cpp
+++ b/Userland/Libraries/LibJS/Runtime/WeakMap.cpp
@@ -14,7 +14,7 @@ NonnullGCPtr<WeakMap> WeakMap::create(Realm& realm)
 }
 
 WeakMap::WeakMap(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , WeakContainer(heap())
 {
 }
diff --git a/Userland/Libraries/LibJS/Runtime/WeakRef.cpp b/Userland/Libraries/LibJS/Runtime/WeakRef.cpp
index 7ec917f3d9..546f58bbf2 100644
--- a/Userland/Libraries/LibJS/Runtime/WeakRef.cpp
+++ b/Userland/Libraries/LibJS/Runtime/WeakRef.cpp
@@ -19,7 +19,7 @@ NonnullGCPtr<WeakRef> WeakRef::create(Realm& realm, Symbol& value)
 }
 
 WeakRef::WeakRef(Object& value, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , WeakContainer(heap())
     , m_value(&value)
     , m_last_execution_generation(vm().execution_generation())
@@ -27,7 +27,7 @@ WeakRef::WeakRef(Object& value, Object& prototype)
 }
 
 WeakRef::WeakRef(Symbol& value, Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , WeakContainer(heap())
     , m_value(&value)
     , m_last_execution_generation(vm().execution_generation())
diff --git a/Userland/Libraries/LibJS/Runtime/WeakSet.cpp b/Userland/Libraries/LibJS/Runtime/WeakSet.cpp
index 157e81c2d9..89b1e9e0f2 100644
--- a/Userland/Libraries/LibJS/Runtime/WeakSet.cpp
+++ b/Userland/Libraries/LibJS/Runtime/WeakSet.cpp
@@ -14,7 +14,7 @@ NonnullGCPtr<WeakSet> WeakSet::create(Realm& realm)
 }
 
 WeakSet::WeakSet(Object& prototype)
-    : Object(prototype)
+    : Object(ConstructWithPrototypeTag::Tag, prototype)
     , WeakContainer(heap())
 {
 }
diff --git a/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp b/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp
index a2d0cea678..bbaae69a63 100644
--- a/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/CSSNamespace.cpp
@@ -14,7 +14,7 @@
 namespace Web::Bindings {
 
 CSSNamespace::CSSNamespace(JS::Realm& realm)
-    : JS::Object(*realm.intrinsics().object_prototype())
+    : JS::Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
 }
 
diff --git a/Userland/Libraries/LibWeb/Bindings/LocationPrototype.h b/Userland/Libraries/LibWeb/Bindings/LocationPrototype.h
index f803260011..312229dc11 100644
--- a/Userland/Libraries/LibWeb/Bindings/LocationPrototype.h
+++ b/Userland/Libraries/LibWeb/Bindings/LocationPrototype.h
@@ -19,7 +19,7 @@ class LocationPrototype final : public JS::Object {
 
 public:
     explicit LocationPrototype(JS::Realm& realm)
-        : JS::Object(*realm.intrinsics().object_prototype())
+        : JS::Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     {
     }
 };
diff --git a/Userland/Libraries/LibWeb/Bindings/PlatformObject.cpp b/Userland/Libraries/LibWeb/Bindings/PlatformObject.cpp
index 8c65fa9388..9b00217cc7 100644
--- a/Userland/Libraries/LibWeb/Bindings/PlatformObject.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/PlatformObject.cpp
@@ -17,7 +17,7 @@ PlatformObject::PlatformObject(JS::Realm& realm)
 }
 
 PlatformObject::PlatformObject(JS::Object& prototype)
-    : JS::Object(prototype)
+    : JS::Object(ConstructWithPrototypeTag::Tag, prototype)
 {
 }
 
diff --git a/Userland/Libraries/LibWeb/Bindings/WindowPrototype.h b/Userland/Libraries/LibWeb/Bindings/WindowPrototype.h
index 3562303fcd..495f18a18d 100644
--- a/Userland/Libraries/LibWeb/Bindings/WindowPrototype.h
+++ b/Userland/Libraries/LibWeb/Bindings/WindowPrototype.h
@@ -17,7 +17,7 @@ class WindowPrototype final : public JS::Object {
 
 public:
     explicit WindowPrototype(JS::Realm& realm)
-        : JS::Object(cached_web_prototype(realm, "EventTarget"))
+        : JS::Object(ConstructWithPrototypeTag::Tag, cached_web_prototype(realm, "EventTarget"))
     {
     }
 };
diff --git a/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp b/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp
index 99550c593d..dd392d90f6 100644
--- a/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp
+++ b/Userland/Libraries/LibWeb/DOM/IDLEventListener.cpp
@@ -14,7 +14,7 @@ JS::NonnullGCPtr<IDLEventListener> IDLEventListener::create(JS::Realm& realm, JS
 }
 
 IDLEventListener::IDLEventListener(JS::Realm& realm, JS::NonnullGCPtr<WebIDL::CallbackType> callback)
-    : JS::Object(*realm.intrinsics().object_prototype())
+    : JS::Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     , m_callback(move(callback))
 {
 }
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObject.cpp b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObject.cpp
index 8fa738a005..bd616a0982 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObject.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObject.cpp
@@ -19,7 +19,7 @@
 namespace Web::Bindings {
 
 WebAssemblyInstanceObject::WebAssemblyInstanceObject(JS::Realm& realm, size_t index)
-    : Object(Bindings::ensure_web_prototype<WebAssemblyInstancePrototype>(realm, "WebAssemblyInstancePrototype"))
+    : Object(ConstructWithPrototypeTag::Tag, Bindings::ensure_web_prototype<WebAssemblyInstancePrototype>(realm, "WebAssemblyInstancePrototype"))
     , m_index(index)
 {
 }
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObjectPrototype.h b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObjectPrototype.h
index 36ba30e1d1..76606d3295 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObjectPrototype.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObjectPrototype.h
@@ -18,7 +18,7 @@ class WebAssemblyInstancePrototype final : public JS::Object {
 
 public:
     explicit WebAssemblyInstancePrototype(JS::Realm& realm)
-        : JS::Object(*realm.intrinsics().object_prototype())
+        : JS::Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     {
     }
 
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyMemoryPrototype.h b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyMemoryPrototype.h
index dafe9db7a5..927758bd68 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyMemoryPrototype.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyMemoryPrototype.h
@@ -18,7 +18,7 @@ class WebAssemblyMemoryPrototype final : public JS::Object {
 
 public:
     explicit WebAssemblyMemoryPrototype(JS::Realm& realm)
-        : JS::Object(*realm.intrinsics().object_prototype())
+        : JS::Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     {
     }
 
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModuleObject.cpp b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModuleObject.cpp
index 64be19cab8..70cd7c2d82 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModuleObject.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModuleObject.cpp
@@ -11,7 +11,7 @@
 namespace Web::Bindings {
 
 WebAssemblyModuleObject::WebAssemblyModuleObject(JS::Realm& realm, size_t index)
-    : Object(Bindings::ensure_web_prototype<WebAssemblyModulePrototype>(realm, "WebAssemblyModulePrototype"))
+    : Object(ConstructWithPrototypeTag::Tag, Bindings::ensure_web_prototype<WebAssemblyModulePrototype>(realm, "WebAssemblyModulePrototype"))
     , m_index(index)
 {
 }
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModulePrototype.h b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModulePrototype.h
index 3f1a7060f8..63155ae0d1 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModulePrototype.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModulePrototype.h
@@ -18,7 +18,7 @@ class WebAssemblyModulePrototype final : public JS::Object {
 
 public:
     explicit WebAssemblyModulePrototype(JS::Realm& realm)
-        : JS::Object(*realm.intrinsics().object_prototype())
+        : JS::Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     {
     }
 };
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp
index b2830f18eb..ea4507cd0b 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp
@@ -26,7 +26,7 @@
 namespace Web::Bindings {
 
 WebAssemblyObject::WebAssemblyObject(JS::Realm& realm)
-    : Object(*realm.intrinsics().object_prototype())
+    : Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
 {
     s_abstract_machine.enable_instruction_count_limit();
 }
@@ -483,7 +483,7 @@ JS::NativeFunction* create_native_function(JS::VM& vm, Wasm::FunctionAddress add
 }
 
 WebAssemblyMemoryObject::WebAssemblyMemoryObject(JS::Realm& realm, Wasm::MemoryAddress address)
-    : Object(Bindings::ensure_web_prototype<WebAssemblyMemoryPrototype>(realm, "WebAssemblyMemoryPrototype"))
+    : Object(ConstructWithPrototypeTag::Tag, Bindings::ensure_web_prototype<WebAssemblyMemoryPrototype>(realm, "WebAssemblyMemoryPrototype"))
     , m_address(address)
 {
 }
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTableObject.cpp b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTableObject.cpp
index 7e90fffecf..d03c4461a0 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTableObject.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTableObject.cpp
@@ -11,7 +11,7 @@
 namespace Web::Bindings {
 
 WebAssemblyTableObject::WebAssemblyTableObject(JS::Realm& realm, Wasm::TableAddress address)
-    : Object(Bindings::ensure_web_prototype<WebAssemblyTablePrototype>(realm, "WebAssemblyTablePrototype"))
+    : Object(ConstructWithPrototypeTag::Tag, Bindings::ensure_web_prototype<WebAssemblyTablePrototype>(realm, "WebAssemblyTablePrototype"))
     , m_address(address)
 {
 }
diff --git a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTablePrototype.h b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTablePrototype.h
index d626f30b35..09e29be2b0 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTablePrototype.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTablePrototype.h
@@ -18,7 +18,7 @@ class WebAssemblyTablePrototype final : public JS::Object {
 
 public:
     explicit WebAssemblyTablePrototype(JS::Realm& realm)
-        : JS::Object(*realm.intrinsics().object_prototype())
+        : JS::Object(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
     {
     }