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> IIUC, that usage is an equivalent transformation, i.e. the code doesn't
> change its behavior. It is mere refactorization.
I changed os.getenv() to accept byte string key (in a previous commit), but I don't like this hack. If we have os.environb, os.getenv() shouldn't support bytes anymore (but use str only, as before).
--
I worked a little more on fsencode()/os.environb, trying to fix all issues. fsdecode() is no more needed if we have os.environb, and fsencode() can be simplified to:
 def fsencode(value):
 return value.encode(sys.getfilesystemencoding(), 'surrogateescape')
fsdecode() leads to mojibake.