{extra-argument (maps/zipmap [a] [1] [2])
 integer-key (maps/zipmap [1] [a])
 keys-not-list (maps/zipmap a [1])
 missing-values (maps/zipmap [a])
 no-arguments (maps/zipmap)
 null-key (maps/zipmap [null] [a])
 values-not-list (maps/zipmap [a] 1)}