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6.22.2 Additional character comparisons

The following bindings are exported by the library (vicare).

Procedure: char!=? char0 char

The arguments must be characters. Return #t if the arguments are all different: no two arguments are equal; otherwise return #f. When applied to a single argument: return #f.

Procedure: char-ci!=? char0

Like char!=? but operate on the case–folded versions of the arguments.

Function: chmin ch0 ch
Function: chmax ch0 ch

Return the minimum or maximum character among the arguments.