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52dcfe11af
Up to now, in normal locales \x was essentially the same as \X, except that it errored if given a value > 0x7f. That's kind of annoying and useless. A subtle change is that `\xHH` now represents the character (if any) encoded by the byte value "HH", so even for values <= 0x7f if that's not the same as the ASCII value we would diverge. I do not believe anyone has ever run fish on a system where that distinction matters. It isn't a thing for UTF-8, it isn't a thing for ASCII, it isn't a thing for UTF-16, it isn't a thing for any extended ASCII scheme - ISO8859-X, it isn't a thing for SHIFT-JIS. I am reasonably certain we are making that same assumption in other places. Fixes #1352