I don't think you should be relying on anything like this. I would
expect, but not want to rely on, two hashsets or hashmaps with the
same contents generating same-order seqs. It definitely fails for
PersistentArrayMaps:
user=> (seq {1 1 2 2 4 4})
([1 1] [2 2] [4 4])
user=> (seq {4 4 2 2 1 1})
([4 4] [2 2] [1 1])
Those seem to seq out in the reverse order their mappings were made
(and literals seem to get reversed):
user=> (seq (assoc {1 1 2 2} 4 4))
([4 4] [1 1] [2 2])
user=> (seq (assoc {4 4 2 2} 1 1))
([1 1] [4 4] [2 2])
(Array, my foot, looks more like the new mappings are just being
consed onto the start of a list to me!)
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