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Migrate to buffering macros #1391

Job	Run time
minimal-versions / minimal-versions	1m 51s
set-msrv / set-msrv	4s
test (1.85.0)	1m 55s
test (stable)	1m 59s
build (stable, thumbv7em-none-eabi)	26s
build (stable, wasm32-unknown-unknown)	25s
build (1.85.0, wasm32-unknown-unknown)	34s
build (1.85.0, thumbv7em-none-eabi)	28s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 32s
cross (1.85.0, powerpc-unknown-linux-gnu, default)	1m 21s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 10s
cross (1.85.0, aarch64-unknown-linux-gnu, default)	1m 6s
	12m 51s

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