[issue31020] Add support for custom compressor in tarfile

[insomniacslk]

insomniacslk added the comment:

The documentation should be updated to suggest that a custom file-like object can be passed to have custom compressors then.

However this sounds very hacky and definitely not a feature that can be easily passed to the user. Hence the reason for a cleaner, explicitly advertised interface.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31020>
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