dbl

stack zeroization #1902

Job	Run time
test (1.85.0)	15s
test (stable)	9s
build (1.85.0, wasm32-unknown-unknown)	16s
build (1.85.0, thumbv7em-none-eabi)	14s
build (stable, thumbv7em-none-eabi)	9s
minimal-versions / minimal-versions	28s
build (stable, wasm32-unknown-unknown)	12s
	1m 43s

Provide feedback