The size of the futures returned from our various methods are really large, to the point of triggering stack overflows on Windows in some of our tests. We should investigate how to reduce the size of these futures to avoid that as well as possibly improve performance.

Related: https://github.com/rust-lang/wg-async-foundations/blob/master/src/vision/submitted_stories/status_quo/alan_runs_into_stack_trouble.md