[issue28286] gzip guessing of mode is ambiguilous

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Or maybe FutureWarning is better than DeprecationWarning.

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Added file: http://bugs.python.org/file44939/gzip_deprecate_implicit_write2.patch

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<http://bugs.python.org/issue28286>
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