Calling flatten on anything that is not 'sequential?' returns an empty
sequence:
(flatten 1); => ()
(flatten "Hi"); => ()
With sets if feels somewhat strange:
(flatten #{#{:a} #{:b :c}}); => ()
For some reason I expected #{#{:a} #{:b :c}} to equal #{:a :b :c}.
Ok, the docstring says: "Takes any nested combination of sequential
things...", and sets are not sequential...
But then, why
(reduce + (flatten #{1 2})); => 0
(r/reduce + (r/flatten #{1 2})); => 3 ?
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