bug#38375: 26.3.50; map-contains-key can't detect nil

[Damien Cassou]

The code below inserts the pair (nil, 'value) in a hash table. I expect
`map-contains-key' to return t when passed the key nil as argument.

(ert-deftest test-map-contains-key-with-nil-has-key-in-hashtable ()
  (let ((map (make-hash-table :test 'equal)))
    (puthash nil 'value map)
    (should (map-contains-key map nil))))

-- 
Damien Cassou

"Success is the ability to go from one failure to another without
losing enthusiasm." --Winston Churchill