Correct, libraries do have to either pick a specific async IO library or use a trait for async IO. I have seen some of the latter in embedded-land, although I'

Correct, libraries do have to either pick a specific async IO library or use a trait for async IO. I have seen some of the latter in embedded-land, although I'm not sure if it's used in desktop async rust as well. The rust compiler currently discourages async traits with a warning, which seems wrong to me, but we use them extensively in embedded anyway.