[issue34498] Python 3.7+ break on singledispatch_function.register(pseudo_type), which Python 3.6 accepted

[Alex Waygood]

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


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keywords: +patch
nosy: +AlexWaygood
nosy_count: 8.0 -> 9.0
pull_requests: +27759
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/29508

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<https://bugs.python.org/issue34498>
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