I've implemented the set operators we discussed, and am now developing
test cases.
In the process, I'm finding that it would be handy to have set equality
and subset/superset testing. These would be (for type equivalence sets):
s1 == s2 iff both sets have exactly the same members
s1 < s2 iff every element in s1 is in s2, but s2 has some
elements not in s1
analogous <=, >, >=, != operators
These can already be implemented in terms of existing operators
(if I haven't screwed something up):
s1 == s2 <=> |s1 & s2| == |s1 | s2|
s1 < s2 <=> |s1 & s2| == |s1| && |s1| < |s2|
Any concerns with adding these too?
Vern
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