[issue39511] [subinterpreters] Per-interpreter singletons (None, True, False, etc.)

[STINNER Victor]

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

Ah, I also found the idea of immortal None in an old discussion on tagged pointer:
https://mail.python.org/archives/list/capi-sig@python.org/thread/JPUNPN3AILGXOA3C2TTSLMOFNSWJE3QX/

Stefan Behnel proposed the idea: "All negative refcounts would have special meanings, such as: this is the immortal None, (...)".

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