silence warnings: use int32_t for chars more consistently #282
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Fixes the warnings introduced by #277, and noted here: #280 (comment)
cc @eschnett
(I don't recall why
int32_tis used for characters, rather than unsigned; maybe-1is used as a sentinel somewhere? Or maybe it's becausewchar_tis often signed on Unix systems where it is 32 bits? In any case, it's safe, since the maximum codepoint is only10FFFF.)