A very narrow attempt at Python 3.10 support #380
Merged
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There is also the PyAV stuff #379 but that is out of our hands...
This PR contains:
Python 3.10 support: collections no longer exports Mapping
This was emitting a DeprecationWarning since Python 3.3 but we never saw it... See https://docs.python.org/3/whatsnew/3.9.html#you-should-check-for-deprecationwarning-in-your-code