provide a mechanism to determine if io read/write halves are from the… #2369

Job	Run time
cargo +stable build	38s
cargo clippy	26s
cargo +beta build	42s
codegen	25s
cargo bench	2m 16s
cargo +nightly build	1m 1s
cargo +1.36 build (futures-{core, io, sink})	5m 3s
cargo doc	33s
cargo hack check --feature-powerset	2m 39s
cargo fmt	11s
cargo minimal-versions build	29s
cargo miri test	7m 29s
cargo build --target thumbv7m-none-eabi	29s
cargo test -Z sanitizer=address	5m 32s
cargo build --target thumbv6m-none-eabi	37s
cargo test -Z sanitizer=memory	3m 38s
cargo +1.56 build	1m 48s
cargo test -Z sanitizer=thread	2m 10s
cargo test (ubuntu-latest)	2m 56s
cargo test (macos-latest)	5m 10s
cargo test (windows-latest)	6m 4s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 19s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	9m 50s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 35s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 3s
	1h 13m 3s

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