Version 4.8.271.13 (cherry-pick)

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 99fc1be90580b28d391221fd55d7355e9c292eee..7a70e4724f24f2054c38fdc00749d084a751a3d7 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -14177,6 +14177,8 @@ static bool ShouldConvertToFastElements(JSObject* object,
 
   uint32_t dictionary_size = static_cast<uint32_t>(dictionary->Capacity()) *
                              SeededNumberDictionary::kEntrySize;
+
+  // Turn fast if the dictionary only saves 50% space.
   return 2 * dictionary_size >= *new_capacity;
 }