[issue11303] b'x'.decode('latin1') is much slower than b'x'.decode('latin-1')

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

> That won't work, Victor, since it makes invalid encoding
> names valid, e.g. 'utf(=)-8'.

That already works in Python (thanks to encodings.normalize_encoding).
The problem with the patch is that it makes names like 'iso88591' valid.
Normalize to 'iso 8859 1' should solve this problem.

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