eax

ocb3: restrict minimum `NonceSize` to `U6` (#593) #733

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	57s
build (1.56.0, wasm32-unknown-unknown)	54s
test (1.56.0)	1m 8s
build (stable, thumbv7em-none-eabi)	19s
test (stable)	15s
build (stable, wasm32-unknown-unknown)	8s
	3m 41s

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