[issue32604] Expose the subinterpreters C-API in Python for testing use.

[STINNER Victor]

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

The commit a1d9e0accd33af1d8e90fc48b34c13d7b07dcf57 introduced reference leaks:

$ ./python -m test -R 3:3 test__xxsubinterpreters -m test.test__xxsubinterpreters.RunFailedTests.test_traceback_propagated
(...)
test__xxsubinterpreters leaked [1863, 1861, 1863] references, sum=5587
test__xxsubinterpreters leaked [559, 558, 559] memory blocks, sum=1676
(...)

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nosy: +vstinner

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<https://bugs.python.org/issue32604>
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