Migrate to buffering macros #1232

Job	Run time
set-msrv / set-msrv	4s
minimal-versions / minimal-versions	56s
test (stable)	41s
test (1.85.0)	47s
build (1.85.0, wasm32-unknown-unknown)	25s
build (1.85.0, thumbv7em-none-eabi)	24s
build (stable, thumbv7em-none-eabi)	28s
build (stable, wasm32-unknown-unknown)	29s
	4m 14s

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