Current uim implementation uses integer as character. It should be replaced with real R5RS characters by adding --enable-char to configure. And the Scheme codes must be rewritten to follow it. I'll rewrite SigScheme's SRFI-75 support into R6RS characters soon to support Unicode chars to conform to the latest standard.
It had been introduced. The legacy integer-based charcter procedures that have conflicted names with R5RS ones are renamed to ichar-* and separated to ichar.scm as obsoleted utils.
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