[issue38591] Deprecate Process Child Watchers

[Kyle Stanley]

Kyle Stanley <aeros167 at gmail.com> added the comment:

> I think so. It will take a long before we remove it though.

In that case, it could be a long term deprecation notice, where we start the deprecation process without having a definitive removal version. This will at least encourage users to look towards using the other watchers instead of FastChildWatcher. I can start working on a PR.

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<https://bugs.python.org/issue38591>
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