> See also get_standard_encoding() in Python/codecs.c. I suppose it is faster.

I understand that PyCodec_SurrogatePassErrors() is already called with a normalized encoding name.

With my enhanced _Py_normalize_encoding(), strange syntaxes like " utf 8 " also take the fast path.


> UTF-32 is rarely used as external encoding, but ...

Ok, I used the same design than get_standard_encoding() to match the "utf" prefix, so having a fast-path for UTF-16 and UTF-32 doesn't add new strcmp() for "latin9".

I pushed my change, so I close the issue.