[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

I wrote a draft PR to make interned strings per-interpreter. It does crash because it requires to make method cache and _PyUnicode_FromId() (bpo-39465) compatible with subinterpreters.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40521>
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