contrib/python-zstandard/LICENSE

config: reject str sections and keys on Python 3

Otherwise we could end up with a dict having both the str
and bytes versions of a particular config item. This may cause
some tests to regress. I haven't checked. But it is better
behavior to fail fast.

We could just as easily change this to normalize the values. But
I like catching all non-compliant call sites first.

Differential Revision: https://phab.mercurial-scm.org/D5649

Copyright (c) 2016, Gregory Szorc
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