Jonathan Lang wrote:
BTW, are the ASCII equivalents spelled (<), (>) and (in)?
I'd hope that they'd be something like '(<)', '(>)', and 'in'; only
use parentheses when neccessary. Likewise, I'd want the "relative
complement" operator to be '-', not '(-)'.
Funny. I would have hoped that the parens unequivocally indicate
set operations. The set difference should be (-) on the basis that
numeric minus should subtract their cardinalities much like it does
for arrays and hashes.