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Of those, Pin, by some margin.

But also Pin is the one you're least likely to run into in most projects.

Yeah, I can't really see why anyone outside of the implementers of the low-level futures runtimes would need to interact with Pin directly.

is this directly enough?

I mean, in practice Rc is the one I run into the least, but pin only comes up occasionally, yes. Maybe once or twice a year on one of my projects.