function
boot.janet on line 1249, column 1
(invert ds)
Returns a table where the keys of an associative data structure are
the values, and the values of the keys. If multiple keys have the same
value, one key will be ignored.
(invert {:a 1 :b 2 :c 3})
# => @{3 :c 1 :a 2 :b}