[issue25416] Add encoding aliases from the (HTML5) Encoding Standard

[Ezio Melotti]

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

Adding those aliases sounds good to me.  I think it would be good to add some tests first (possibly as a separate issue/pr), even though I'm not sure what would be the best way to test the aliases.

Testing if the list is complete/correct should be done against the HTML5/Unicode specs, but that, if automated, would require downloading/parsing the specs and is probably not worth doing it.

We can also check that all the aliases are accepted by str.encode/decode, and all corresponding aliases should give the same result, however if str.encode/decode use the aliases dict, the test is nothing more than a sanity check and won't detect e.g. typos in the aliases names, or wrongly assigned aliases.

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nosy: +fbidu
stage: patch review -> test needed
versions: +Python 3.8 -Python 3.6

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