Returns a value like
cl:both-case-p, but using specified Unicode rules.
unicode-both-case-p char &key style => flag
A generalized boolean
unicode-both-case-p returns flag as true if char has case according to the Unicode rules specified by style.
The current implementation only supports one style:
Use the "general category" for char in Unicode 6.3.0.
The name of
unicode-both-case-p is slightly confusing, because it matches the ANSI Common Lisp definition "a character with case" whereas there is no guarantee that both cases actually exist. Note also that there are some "alpha" chars which are not lower or upper case.
LispWorks User Guide and Reference Manual - 20 Sep 2017