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Re:JetBrains Mono – the free and open-source typeface for de... by timw4mail on Thursday January 20, 2022 @02:12PM (#30013239)
It's a very common logic operator across a multitude of languages. In what situation do you have that sequence of characters that isn't a logic operator?
Re:JetBrains Mono – the free and open-source typeface for de... by jonnycomputer on Thursday January 20, 2022 @04:54PM (#30015660)
~= and <> are common-enough, e.g. in Matlab, SQL

Having a ligature for != but not for the others betrays its language-independent semantics.

!= in Matlab is not legal logic operator.

Also, != might be part of regular expression.

Re:JetBrains Mono – the free and open-source typeface for de... by gnull on Thursday January 20, 2022 @07:10PM (#30017332)
https://hoogle.haskell.org/?hoogle=%28%21%3D%29&scope=set%3A...

Using Haskell is one such situation. Haskell's inequality operator is /= which someone could expect when they see ≠. Some people redefine != as a custom operator (see link), which can bring even more confusion with this ligatures.