[issue25007] Add support of copy protocol to zlib compressors and decompressors

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I agree with Josh. Needed __deepcopy__ and tests. And I think there may be problem with sharing a docstring (that includes a signature) between copy() and __copy__(). It is better to just add separate method that calls the implementation of copy().

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25007>
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