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.

Regards, TSa.

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