Inada Naoki <songofaca...@gmail.com> added the comment:

I think it is too late. Python 3.9 has been released already.  Reverting the 
change is also breaking change.

PEP 100 says:
"Search functions are expected to take one argument, the encoding name in all 
lower case letters and with hyphens and spaces converted to underscores"
https://www.python.org/dev/peps/pep-0100/#codecs-coder-decoders-lookup

But codecs.register() says:
"Search functions are expected to take one argument, being the encoding name in 
all lower case letters".

I don't know historical reason why two document are inconsistent.
https://docs.python.org/3/library/codecs.html#codecs.register

----------
nosy: +methane

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