[issue42085] Add dedicated slot for sending values

[Martmists]

Change by Martmists <martmists at gmail.com>:


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nosy: +martmists
nosy_count: 4.0 -> 5.0
pull_requests: +25048
pull_request: https://github.com/python/cpython/pull/25465

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42085>
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