[issue36268] Change default tar format to modern POSIX 2001 (pax) for better portability/interop, support and standards conformance

[C.A.M. Gerlach]

C.A.M. Gerlach <CAM.Gerlach at Gerlach.CAM> added the comment:

Sure, in work now. Its my first contribution to CPython, so bear with me. I presume this is too trivial to go in the What's New in Python article, but does merit a NEWS entry so users are aware of the change? Aside from changing [this line](https://github.com/python/cpython/blob/3fe7fa316f74ed630fbbcdf54564f15cda7cb045/Lib/tarfile.py#L108), updating the documentation to reflect the change, and possibly adding a NEWS entry, is there anything else that needs to be done? Thanks.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36268>
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