[issue40521] [subinterpreters] Make free lists and unicode caches per-interpreter

[STINNER Victor]

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

> I reopen the issue to remind me that collections.deque() freelist is shared by all interpreters.

Each deque instance now has its own free list.

But dtoa.c still has a per-process cache, shared by all interpreters.

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<https://bugs.python.org/issue40521>
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