stack zeroization #1878

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	16s
minimal-versions / minimal-versions	25s
build (stable, wasm32-unknown-unknown)	17s
build (stable, thumbv7em-none-eabi)	17s
test (stable)	15s
test (1.85.0)	15s
build (1.85.0, thumbv7em-none-eabi)	16s
	2m 1s

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