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

[STINNER Victor]

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

bpo-40255 proposes a concrete implementation of immortal objects: it modifies Py_INCREF and Py_DECREF which makes Python up to 1.17x slower.

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<https://bugs.python.org/issue39511>
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