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diff (clj)
(source)function
(diff a b)
Recursively compares a and b, returning a tuple of
[things-only-in-a things-only-in-b things-in-both].
Comparison rules:
* For equal a and b, return [nil nil a].
* Maps are subdiffed where keys match and values differ.
* Sets are never subdiffed.
* All sequential things are treated as associative collections
by their indexes, with results returned as vectors.
* Everything else (including strings!) is treated as
an atom and compared for equality.