39.12.3 Predicates/Comparison
Use these procedures for testing whether an object is a character set,
or whether several character sets are equal or subsets of each other.
char-set-hash can be used for calculating a hash value, maybe for
usage in fast lookup procedures.
— Scheme Procedure:
char-set? obj
Return #t if obj is a character set, #f
otherwise.
— Scheme Procedure:
char-set= [
charsets ...]
Return #t if all given charsets are equal.
— Scheme Procedure:
char-set<= [
charsets ...]
Return #t if every character set csi is a subset
of character set csi+1.
— Scheme Procedure:
char-set-hash cs [
bound]
Compute a hash value for the character set cs. If
bound is given and non-zero, it restricts the
returned value to the range 0 ... bound − 1.