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

[junyixie]

junyixie <xie.junyi at outlook.com> added the comment:

Should Make dtoa bigint free list per-interpreter.

static Bigint *bigint_freelist[Kmax+1]; -> _is { Bigint *bigint_freelist[Kmax+1]; }

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message_count: 43.0 -> 44.0
nosy: +JunyiXie
nosy_count: 5.0 -> 6.0
pull_requests: +23587
pull_request: https://github.com/python/cpython/pull/24821

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