Scheme char library
. __Authors:__ CSCM Contributor ([`the-concurrent-schemer@googlegroups.com`](mailto:the-concurrent-schemer@googlegroups.com)).
'$scml_exports'() -> [{scm_symbol(), scmi_nip()}]
'char-alphabetic?'(C::scm_char()) -> scm_boolean()
'char-ci<=?'(Cs::[scm_char(), ...]) -> scm_boolean()
'char-ci<?'(Cs::[scm_char(), ...]) -> scm_boolean()
'char-ci=?'(Cs::[scm_char(), ...]) -> scm_boolean()
'char-ci>=?'(Cs::[scm_char(), ...]) -> scm_boolean()
'char-ci>?'(Cs::[scm_char(), ...]) -> scm_boolean()
'char-downcase'(C::scm_char()) -> scm_char()
'char-foldcase'(C::scm_char()) -> scm_char()
'char-lower-case?'(L::scm_letter()) -> scm_boolean()
'char-numeric?'(C::scm_char()) -> scm_boolean()
'char-upcase'(C::scm_char()) -> scm_char()
'char-upper-case?'(L::scm_letter()) -> scm_boolean()
'char-whitespace?'(C::scm_char()) -> scm_boolean()
'digit-value'(C::scm_char()) -> 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | scm_false()
'string-ci<=?'(Ss::[scm_string(), ...]) -> scm_boolean()
'string-ci<?'(Ss::[scm_string(), ...]) -> scm_boolean()
'string-ci=?'(Ss::[scm_string(), ...]) -> scm_boolean()
'string-ci>=?'(Ss::[scm_string(), ...]) -> scm_boolean()
'string-ci>?'(Ss::[scm_string(), ...]) -> scm_boolean()
'string-downcase'(S::scm_string()) -> scm_string()
'string-foldcase'(S::scm_string()) -> scm_string()
'string-upcase'(S::scm_string()) -> scm_string()