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Adds in signed char bits as discussed by Paolo and Howard, and tests. In addition, this adds compile-time warnings on things like __gnu_cxx::__remove_unsigned<float>::__type __gnu_cxx::__add_unsigned<bool>::__type 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 -benjamin
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