bug#1726: 23.0.60; end-of-sentence and non-breaking space

[Richard M Stallman]

    IIUC if you want the character with code #xa0, then using \u00a0 would
    seem like the most unambiguous option (I notice that "\ua0" gives
    a weird error "Non-hex digit used for Unicode escape").

I expected \xa0 to give me that character.  It still seems strange
that it would do anything else.

When I read the documentation of \u, I thought it meant "unicode" as
opposed to "Emacs's internal code".  Since I knew that Emacs now
follows unicode for these characters, I saw no reason to consider
using \u.