[issue42943] singledispatchmethod should expose registry of all known overloads

[Alex Waygood]

Change by Alex Waygood <Alex.Waygood at Gmail.com>:


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nosy: +AlexWaygood
versions: +Python 3.11 -Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42943>
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