[issue41324] Add a minimal decimal capsule API

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I probably won't try it out explicitly (it's basically cumbersome for us to test with non-release Pythons, because of our dependencies to Numpy and Cython), but reviewing the API should be enough anyway.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41324>
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