STINNER Victor <> added the comment:

> The change is backwards incompatible and a backport would break things. See 
> for example how it breaks latexcodec:

I reopen the issue. I proposed PR 17997 to *document* the incompatible change 
in What's New in Python 3.8. IMO it's a deliberate change and it's correct.

I rely on Marc-Andre Lemburg who implemented codecs and encodings modules. He 
wrote: "Jordon is right. Conversion has to be to underscores, not hyphens.".

resolution: fixed -> 
status: closed -> open

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