Comment by ReleaseCandidat

But they don't actually work, because there are many ambiguities. Is <= "less than or equal" or an arrow pointing to the left? And in the other direction too: is ≠ "!=" or "/=" or something else? And as soon as you allow 3 or more characters to build ligatures, your number of ligatures explodes, but you still miss some. For example it doesn't matter if <= is an arrow or LTE and => is an arrow, in a <=> all are wrong, same as in a >=> or a >>= or...