[Distutils] inconsistency between PEP425 and wheel tags

[Nick Coghlan]

The problem is that sys.implementation is relatively new, so there's no
standard way to retrieve the implementation version prior to that addition
to the language spec. I agree the PEP should be explicit that that tag
needs to reflect the implementation's *ABI* stability, which may or may not
align with the Python language version.

We're going to need an update to the compatibility tagging spec to sort out
the Linux distro compatibility issues anyway, so perhaps someone is
prepared to tackle a revision to the compatibility tagging PEP?

(The relevant repo for draft specs is
https://bitbucket.org/pypa/pypi-metadata-formats - although it occurs to me
that could use some tags to reflect published versions of accepted PEPs)

Cheers,
Nick.
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