Migrate to buffering macros #1191

Job	Run time
set-msrv / set-msrv	3s
minimal-versions / minimal-versions	33s
test (stable)	26s
test (1.85.0)	42s
build (stable, thumbv7em-none-eabi)	14s
build (1.85.0, thumbv7em-none-eabi)	31s
build (stable, wasm32-unknown-unknown)	16s
build (1.85.0, wasm32-unknown-unknown)	26s
	3m 11s

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