One high-level comment: Is there a particular reason why SetIterator and
MapIterator are JSObjects (with mutable properties and elements)? Will they ever
be exposed to user-land JavaScript? If not then I would vote for making them
internal objects (ideally a subclass of v8::internal::Struct). That should
simplify the implementation (e.g. no context-dependent map for these objects,
support code is automatically generated, fixed instance size).

https://codereview.chromium.org/236143002/

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