[issue4688] GC optimization: don't track simple tuples and dicts

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I've added tracking statistics for tuples, documentation for
gc.is_tracked(), and changed _Py*_Optimize to _Py*_MaybeUntrack on a
suggestion by Benjamin. Committed to trunk in r70546.

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resolution: accepted -> fixed
status: open -> closed

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