Guarantees on yieldability of __call metamethod?

[HaroldCindy]

I've been looking at the various API guarantees that Luau makes, and noticed that while it says that metamethods do not allow yielding, __call currently does. It seems pretty obvious that __call should work given how little work allowing that requires under the current VM, but I don't see that behavior guaranteed anywhere.

Is this something that's liable to change, or can we rely on the yieldability of __call in future versions?