Re: Just curious: who is using Pike for what?

There is things like

# Language-Sensitive Mappings
# These are characters whose full case mappings depend on language and perhaps also
# context (which characters come before or after). For more information
# see the header of this file and the Unicode Standard.

# Lithuanian retains the dot in a lowercase i when followed by accents.
# Remove DOT ABOVE after "i" with upper or titlecase
0307; 0307; ; ; lt After_Soft_Dotted; # COMBINING DOT ABOVE

which is going to require a locale argument.