diff --git a/Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp b/Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
index 187484cbad..070ea5664b 100644
--- a/Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
+++ b/Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
@@ -1169,7 +1169,7 @@ Object* create_mapped_arguments_object(VM& vm, FunctionObject& function, Vector<
 }
 
 // 7.1.21 CanonicalNumericIndexString ( argument ), https://tc39.es/ecma262/#sec-canonicalnumericindexstring
-CanonicalIndex canonical_numeric_index_string(PropertyKey const& property_key, CanonicalIndexMode mode)
+ThrowCompletionOr<CanonicalIndex> canonical_numeric_index_string(VM& vm, PropertyKey const& property_key, CanonicalIndexMode mode)
 {
     // NOTE: If the property name is a number type (An implementation-defined optimized
     // property key type), it can be treated as a string property that has already been
@@ -1219,11 +1219,10 @@ CanonicalIndex canonical_numeric_index_string(PropertyKey const& property_key, C
     auto maybe_double = argument.to_double(AK::TrimWhitespace::No);
     if (!maybe_double.has_value())
         return CanonicalIndex(CanonicalIndex::Type::Undefined, 0);
-    auto double_value = Value(maybe_double.value());
 
     // FIXME: We return 0 instead of n but it might not observable?
     // 3. If SameValue(! ToString(n), argument) is true, return n.
-    if (double_value.to_deprecated_string_without_side_effects() == argument)
+    if (TRY_OR_THROW_OOM(vm, number_to_string(*maybe_double)) == argument.view())
         return CanonicalIndex(CanonicalIndex::Type::Numeric, 0);
 
     // 4. Return undefined.
diff --git a/Userland/Libraries/LibJS/Runtime/AbstractOperations.h b/Userland/Libraries/LibJS/Runtime/AbstractOperations.h
index 105108c753..90087fc8ec 100644
--- a/Userland/Libraries/LibJS/Runtime/AbstractOperations.h
+++ b/Userland/Libraries/LibJS/Runtime/AbstractOperations.h
@@ -57,7 +57,7 @@ enum class CanonicalIndexMode {
     DetectNumericRoundtrip,
     IgnoreNumericRoundtrip,
 };
-CanonicalIndex canonical_numeric_index_string(PropertyKey const&, CanonicalIndexMode needs_numeric);
+ThrowCompletionOr<CanonicalIndex> canonical_numeric_index_string(VM&, PropertyKey const&, CanonicalIndexMode needs_numeric);
 ThrowCompletionOr<String> get_substitution(VM&, Utf16View const& matched, Utf16View const& str, size_t position, Span<Value> captures, Value named_captures, Value replacement);
 
 enum class CallerMode {
diff --git a/Userland/Libraries/LibJS/Runtime/PrimitiveString.cpp b/Userland/Libraries/LibJS/Runtime/PrimitiveString.cpp
index c423170596..14c9834083 100644
--- a/Userland/Libraries/LibJS/Runtime/PrimitiveString.cpp
+++ b/Userland/Libraries/LibJS/Runtime/PrimitiveString.cpp
@@ -144,7 +144,7 @@ ThrowCompletionOr<Optional<Value>> PrimitiveString::get(VM& vm, PropertyKey cons
             return Value(static_cast<double>(length));
         }
     }
-    auto index = canonical_numeric_index_string(property_key, CanonicalIndexMode::IgnoreNumericRoundtrip);
+    auto index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm, property_key, CanonicalIndexMode::IgnoreNumericRoundtrip));
     if (!index.is_index())
         return Optional<Value> {};
     auto str = TRY(utf16_string_view());
diff --git a/Userland/Libraries/LibJS/Runtime/StringObject.cpp b/Userland/Libraries/LibJS/Runtime/StringObject.cpp
index e6e12a1a85..f0ee141ebb 100644
--- a/Userland/Libraries/LibJS/Runtime/StringObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringObject.cpp
@@ -47,6 +47,8 @@ static ThrowCompletionOr<Optional<PropertyDescriptor>> string_get_own_property(S
 {
     VERIFY(property_key.is_valid());
 
+    auto& vm = string.vm();
+
     // 1. If Type(P) is not String, return undefined.
     // NOTE: The spec only uses string and symbol keys, and later coerces to numbers -
     // this is not the case for PropertyKey, so '!property_key.is_string()' would be wrong.
@@ -54,7 +56,7 @@ static ThrowCompletionOr<Optional<PropertyDescriptor>> string_get_own_property(S
         return Optional<PropertyDescriptor> {};
 
     // 2. Let index be CanonicalNumericIndexString(P).
-    auto index = canonical_numeric_index_string(property_key, CanonicalIndexMode::IgnoreNumericRoundtrip);
+    auto index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm, property_key, CanonicalIndexMode::IgnoreNumericRoundtrip));
 
     // 3. If index is undefined, return undefined.
     // 4. If IsIntegralNumber(index) is false, return undefined.
@@ -74,7 +76,7 @@ static ThrowCompletionOr<Optional<PropertyDescriptor>> string_get_own_property(S
         return Optional<PropertyDescriptor> {};
 
     // 10. Let resultStr be the String value of length 1, containing one code unit from str, specifically the code unit at index ℝ(index).
-    auto result_str = PrimitiveString::create(string.vm(), TRY(Utf16String::create(string.vm(), str.substring_view(index.as_index(), 1))));
+    auto result_str = PrimitiveString::create(vm, TRY(Utf16String::create(vm, str.substring_view(index.as_index(), 1))));
 
     // 11. Return the PropertyDescriptor { [[Value]]: resultStr, [[Writable]]: false, [[Enumerable]]: true, [[Configurable]]: false }.
     return PropertyDescriptor {
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArray.h b/Userland/Libraries/LibJS/Runtime/TypedArray.h
index 1fe3cd5e37..8f1211fe81 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArray.h
+++ b/Userland/Libraries/LibJS/Runtime/TypedArray.h
@@ -191,7 +191,7 @@ public:
         // NOTE: This includes an implementation-defined optimization, see note above!
         if (property_key.is_string() || property_key.is_number()) {
             // a. Let numericIndex be CanonicalNumericIndexString(P).
-            auto numeric_index = canonical_numeric_index_string(property_key, CanonicalIndexMode::DetectNumericRoundtrip);
+            auto numeric_index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm(), property_key, CanonicalIndexMode::DetectNumericRoundtrip));
             // b. If numericIndex is not undefined, then
             if (!numeric_index.is_undefined()) {
                 // i. Let value be IntegerIndexedElementGet(O, numericIndex).
@@ -228,7 +228,7 @@ public:
         // NOTE: This includes an implementation-defined optimization, see note above!
         if (property_key.is_string() || property_key.is_number()) {
             // a. Let numericIndex be CanonicalNumericIndexString(P).
-            auto numeric_index = canonical_numeric_index_string(property_key, CanonicalIndexMode::DetectNumericRoundtrip);
+            auto numeric_index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm(), property_key, CanonicalIndexMode::DetectNumericRoundtrip));
             // b. If numericIndex is not undefined, return IsValidIntegerIndex(O, numericIndex).
             if (!numeric_index.is_undefined())
                 return is_valid_integer_index(*this, numeric_index);
@@ -251,7 +251,7 @@ public:
         // NOTE: This includes an implementation-defined optimization, see note above!
         if (property_key.is_string() || property_key.is_number()) {
             // a. Let numericIndex be CanonicalNumericIndexString(P).
-            auto numeric_index = canonical_numeric_index_string(property_key, CanonicalIndexMode::DetectNumericRoundtrip);
+            auto numeric_index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm(), property_key, CanonicalIndexMode::DetectNumericRoundtrip));
             // b. If numericIndex is not undefined, then
             if (!numeric_index.is_undefined()) {
                 // i. If IsValidIntegerIndex(O, numericIndex) is false, return false.
@@ -301,7 +301,7 @@ public:
         // NOTE: This includes an implementation-defined optimization, see note above!
         if (property_key.is_string() || property_key.is_number()) {
             // a. Let numericIndex be CanonicalNumericIndexString(P).
-            auto numeric_index = canonical_numeric_index_string(property_key, CanonicalIndexMode::DetectNumericRoundtrip);
+            auto numeric_index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm(), property_key, CanonicalIndexMode::DetectNumericRoundtrip));
             // b. If numericIndex is not undefined, then
             if (!numeric_index.is_undefined()) {
                 // i. Return IntegerIndexedElementGet(O, numericIndex).
@@ -328,7 +328,7 @@ public:
         // NOTE: This includes an implementation-defined optimization, see note above!
         if (property_key.is_string() || property_key.is_number()) {
             // a. Let numericIndex be CanonicalNumericIndexString(P).
-            auto numeric_index = canonical_numeric_index_string(property_key, CanonicalIndexMode::DetectNumericRoundtrip);
+            auto numeric_index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm(), property_key, CanonicalIndexMode::DetectNumericRoundtrip));
             // b. If numericIndex is not undefined, then
             if (!numeric_index.is_undefined()) {
                 // i. If SameValue(O, Receiver) is true, then
@@ -363,7 +363,7 @@ public:
         // NOTE: This includes an implementation-defined optimization, see note above!
         if (property_key.is_string() || property_key.is_number()) {
             // a. Let numericIndex be CanonicalNumericIndexString(P).
-            auto numeric_index = canonical_numeric_index_string(property_key, CanonicalIndexMode::DetectNumericRoundtrip);
+            auto numeric_index = MUST_OR_THROW_OOM(canonical_numeric_index_string(vm(), property_key, CanonicalIndexMode::DetectNumericRoundtrip));
             // b. If numericIndex is not undefined, then
             if (!numeric_index.is_undefined()) {
                 // i. If IsValidIntegerIndex(O, numericIndex) is false, return true; else return false.