dbl

stack zeroization #1992

Job	Run time
test (stable)	13s
test (1.85.0)	15s
build (stable, thumbv7em-none-eabi)	21s
build (1.85.0, wasm32-unknown-unknown)	15s
build (stable, wasm32-unknown-unknown)	10s
minimal-versions / minimal-versions	29s
build (1.85.0, thumbv7em-none-eabi)	19s
	2m 2s

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