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Migrate to buffering macros #1397

Job	Run time
minimal-versions / minimal-versions	1m 53s
set-msrv / set-msrv	5s
cross (1.85.0, aarch64-unknown-linux-gnu, default)	1m 3s
build (stable, wasm32-unknown-unknown)	28s
test (stable)	2m 5s
test (1.85.0)	1m 55s
build (1.85.0, wasm32-unknown-unknown)	29s
build (stable, thumbv7em-none-eabi)	24s
build (1.85.0, thumbv7em-none-eabi)	25s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 9s
cross (1.85.0, powerpc-unknown-linux-gnu, default)	1m 20s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 27s
	12m 43s

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