Clash between greater_equal and less_equal signs and equals arrow combinations

[weiweihuanghuang]

<= <== ==> =>
>= >== ==< =<

produces:

There's inconsistency between <= => >= and =< I know that <= and >= is supposed to produce the greater_equal and less_equal ligatures but there's a clash in the subsitution logic here.

[tonsky]

This is done not to be symmetrical but to be practical. Mainstream programming languages don’t have =< as far as i know