Vsevolod Tolstopyatov

Would be nice to understand the root of the issue (it seems like it's `LimitedDispatcher` peculiarity) and address it instead. I don't think avoiding locks on K/N is justified

Might be the case with allocation-spamming lock either, I've asked the user about coroutines version

We discussed it internally -- the specific pattern is caused by hammering the `yield` and #4255 added a sound and an obligatory for correctness extra-unpark on `yield` codepath. There is...