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digest-io: minor fixes (#1173) #740

Job	Run time
build (1.85.0, wasm32-unknown-unknown)	26s
build (1.85.0, thumbv7em-none-eabi)	16s
test (stable)	1m 15s
build (stable, wasm32-unknown-unknown)	17s
test (1.85.0)	15s
build (stable, thumbv7em-none-eabi)	17s
minimal-versions / minimal-versions	26s
	3m 12s

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