HaloO,
Dr.Ruud wrote:
What would be the way to define-or-set that a specific hash has
non-case-sensitive keys?
There are two things in this:
(1) The syntax to type the keys of a hash---too bad that I forgot it
and currently don't find it in the Synopsyses. Pointers welcome!
(2) A way to constrain a string to be case insensitive.
The latter could be nicely stated as
subset CaseInsensitive of Str where { .lc eq .uc }
but it actually is a constraint on the &infix:<eq>, not on
the strings. So I doubt that it works as expected. But then
I'm not sure if one can make subsets of operators at all:
subset CaseInsensitive of eq where { .lc eq .uc }
I guess you have to simply define CaseInsensitive as an alias---that is
an unconstraint subset---and overload &infix:<eq>. Then the hash
hopefully uses this operator when its key type is CaseInsensitive.
--
