[issue29368] Optimize unpickling list-like objects

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

collections.Sequence has no relation to the pickle protocol.

Every object that return listitems from the __reduce__() method must support the extend() method according to the specification.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29368>
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