Treating 'utf-8' and its aliases differently (when they specifically mean the Python's, rather than something else's, encoding) is definitely as issue.

You shouldn't hardcode a list of aliases though; rather use existing facilities to resolve them. From quick googling, e.g. `codecs.lookup(<encoding>).name` can get the canonical name.


Make sure to follow https://devguide.python.org/pullrequest when doing the PR; a test case will likely be needed, too.