Hello, do you plan to reduce number of exclamation marks from two to one somewhere in future?
results!.size looks better than results!!.size
Irrespective of the merits of one versus two ! symbols, that ship has sailed over a year ago (with the release of 1.0). I agree that results!.size looks better, and that is precisely the reason why results!!.size is better. The use of !! is ugly code, so it should look ugly.
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yes, i doubt there is no way to implement results!.size along with results!!.size
I use checkNotNull or requireNotNull 
instead of !! ?
Yes, I prefer IllegalStateException and IllegalArgumentException to NullPointerException.
Obviously I try to avoid each unuseful check.
Otherwise we should require to write result!write
No, we have no such plans. It’s very intentional that !! looks the way it does.
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Correct me if I’m wrong, but I believe they went the double route because it’s something you should only do if you’re 100% sure of it. It’s also easier to debug if you have two instead of one.
I have a question, does the compiler support ‼ instead of !! because if not it definitely should. Thanks
Then the compiler should also support ᠄ for colons, – and — for minus, → for arrows, etc. Does this sound practical?
No, and having multiple variants for each operator sound like a very stupid idea.