Use lossless type conversion in ctype.h
Use lossless type conversion, using c_int::from() rather than the lossy as, in ctype.h.
This has also necessitated the use of byte literals, rather than Unicode chars, in a few places.
Use lossless type conversion, using c_int::from() rather than the lossy as, in ctype.h.
This has also necessitated the use of byte literals, rather than Unicode chars, in a few places.