On Fri, Dec 16, 2016 at 12:28 PM, Pavel Stehule <pavel.stehule@gmail.com> wrote: > why do you need special operator for negation? there is only one use case. > It can be solved by \if_not
That's exactly the kind of thing I *don't* want to do. If you absolutely must have that and you can't wait until we get a full-blown expression evaluator, then just swap the \if side with the \else side and call it good. The whole point here is to avoid introducing weird hacks for lack of a full expression evaluator that will just become annoyances once we have one.
I don't need it. Because we don't expect expression there, then "not" or "if_not" is not necessary.