[issue32630] Migrate decimal to use PEP 567 context variables

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

Stefan, it would be great to have this committed before 3.7 feature freeze.

The change is pretty straightforward -- we replaced threading.local() with a contextvar, which should be a backwards compatible change.

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