Message 104869 - Python tracker

> I think that we cannot decide correctly about fs*code() until we decided for os.environb.

Why is that? In msg104063, you claim that you want to create these
functions to deal with file names (not environment variables), in
msg104064, you claim that #8513 (which is about the program name in
subprocess) would benefit from these functions. Do these use cases
become invalid if os.environb becomes available?