[issue28254] Add C API for gc.enable, gc.disable, and gc.isenabled

[Petr Viktorin]

Change by Petr Viktorin <encukou at gmail.com>:


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nosy: +petr.viktorin
nosy_count: 5.0 -> 6.0
pull_requests: +24411
pull_request: https://github.com/python/cpython/pull/25720

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28254>
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