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Nice

So, some tests are up and running. I will fill them up with all imaginable tail call / non-tailcall combinations.

OTOH Applying this to TaskBuilder is very tricky and probably hopeless, given its type signature.
It returns just a running task and binds to awaitables that also may or may not be already running. I cannot come up with anything that wouldn't be horrendous (like for example communicating between TaskBuilder state machines via an AsyncLocal side channel to signal that we're executing in a recursive taill-call context).

It might be more useful for other computation expressions.

@majocha Just to say a huge, huge thank you for getting this in. We should always have done tailcalls in computation expressions like this, and it's a relief to see it finally in place

Thank you also to @T-Gro for your work in facilitating both the design repos and the implementation!