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A comment on What’s New in Python 3.8. Parent comment

Re:What’s New in Python 3.8 by hirowan on Tuesday October 15, 2019 @07:45AM (#21257492)
The issue with this and `singledispatch` is that they no longer support pseudo-types from the `typing` module [1] so you can't use them with containers of type `x`, e.g. `List[str]`, or protocols like `Sequence`.

[1] https://bugs.python.org/issue34498

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Re:What’s New in Python 3.8 by spott on Tuesday October 15, 2019 @11:51AM (#21259754)
Yea, this one is really annoying... required a lot of rewriting of code to make some old code work with 3.7.
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