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> > Encoding to 'utf-8' or the default file system encoding doesn't seem
> > right (as the characters end up getting stored in the gzip archive itself).
> I don’t understand.
The characters are being stored in the gzip archive as part of the gzip header. The comment in the Python 3 trunk indicates the encoding should be iso-8859-1: https://bitbucket.org/mirror/cpython/src/f3041e7f535d/Lib/tarfile.py#cl-475
My point is that the file system encoding is not relevant here. Because the name is being stored in a gzip blob, it should be encoded according to gzip specs.
> > Additionally, encoding as 'utf-8' would cause the file to be created
> > with a utf-8 filename, which would be undesirable.
> Why?
My concern here was that if we're encoding the string as utf-8 before passing to the __builtins__.open() call, Python might encode _that_ utf-8 string using the file system encoding and save the file that way (where the file is named with a utf-8 encoded string, not the unicode string intended). After further investigation, and based on the work that's been proposed, this is not a risk.