Erlang has =:= and ==. Kind of like how Python has is and ==, JavaScript has == and ===, and Lisp has eq, eql, and equal. The change in the article is about =:

Erlang has =:= and ==. Kind of like how Python has is and ==, JavaScript has == and ===, and Lisp has eq, eql, and equal. The change in the article is about =:=, so NaN =:= NaN does not have to give the same answer as NaN == NaN.