[v3] add_unsigned/remove_unsigned tweaks

Benjamin Kosnik bkoz@redhat.com
Fri Sep 29 12:28:00 GMT 2006

Adds in signed char bits as discussed by Paolo and Howard, and tests.

In addition, this adds compile-time warnings on things like


Even though these constructs are admittedly bizarre, it looks like this "trait" is
converging on semantic meaning, and signed-ness means nothing for
floating point types. (Last time I checked.)

tested x86/linux

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