With CLJS-2456, (empty (first {:a 1})) should return nil, not []. (This is because map entries must have 2 elements.)
(empty (first {:a 1}))
nil
[]
To repro without CLJS-2456: (empty (->MapEntry 1 2 nil)).
(empty (->MapEntry 1 2 nil))
With CLJS-2456,
(empty (first {:a 1}))
should returnnil
, not[]
. (This is because map entries must have 2 elements.)To repro without CLJS-2456:
(empty (->MapEntry 1 2 nil))
.