ok but I'm translating , into a set-theoretic construct, in which
domain a,b is indistinct from a|b - correct me if I have got that
wrong.
sorry you mean the deduping........
well you are no longer dealing in sets ...... so if you apply a
set-theoretic construct then all bets are off and the law of the
jungle applies.
or to put it another way that is as much type abuse as applying a
numeric operator to a string and for that reason I would walk away
from such expressions.
unless the , operator results in a relation rather than a set but then
I'd have to refer to my discrete math text and parse the effect of a
set-theoretic difference operation on a relation if indeed that is
valid thing to do.
sorry above should read bag not relation. Same caveats apply.
The point is there is virtue in parsing a construct in the syntax and
semantics of it's original domain esp when it is well defined and
supported by axioms, in preference to parsing in terms of a
programming language specification that may lack those qualities.
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