Hey @dataman can you show how to use this to replace using `sets`.
Below is a code prototype using `sets`, what would be the equivalent with
`IntSet`.
proc example(a, b, c) =
....
var aset: set[uint16]
....
while n < max
....
aset = {}
for b in x..y:
.....
incl(aset, k.uint16)
.....
count += card(aset))
....
