I think it also depends on how you think of symbols; I see "::" as a single operator, not two symbols. Do () and <> count as individual symbols? I believe you do, given that you have an example upthread.
If those are the case, well, I can construct something, but it's not something I've used directly. Four isn't unheard of if you're going by those rules, but five is a bit extra.
Yes, I consider "::" as two symbols, also yeah I am against ")?)?" but I have seen "worse" in the wild. I think I will have to look for what I saw before we continue. I might not be able to reply to this comment, however.
If those are the case, well, I can construct something, but it's not something I've used directly. Four isn't unheard of if you're going by those rules, but five is a bit extra.
You cited )?)?; a little while ago, I personally would write this code like the final example over here: https://news.ycombinator.com/item?id=43234284