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Yep, that's the problem. Lots of theoretical problems noone has ever encountered
brought up against a PEP which resolves some actual problems people encounter on
a regular basis.
How can you bring up practical problems against something that hasn't been implemented?
The fact that no other language or library does this is perhaps an indication that it isn't the right thing to do.
But the biggest problem with the proposal is that it isn't needed: if you want to be able to turn arbitrary byte sequences into unicode strings and back, just set your encoding to iso8859-15.� That already works and it doesn't require any changes.
Tom