`subtle` feature (#126) #264

Job	Run time
clippy	15s
build (1.85.0, thumbv7em-none-eabi)	19s
rustfmt	10s
build (stable, wasm32-unknown-unknown)	14s
careful	52s
test (1.85.0)	24s
doc	27s
miri (x86_64-unknown-linux-gnu)	41s
miri (s390x-unknown-linux-gnu)	52s
test (stable)	18s
build (1.85.0, wasm32-unknown-unknown)	20s
build (stable, armv7a-none-eabi)	13s
build (1.85.0, armv7a-none-eabi)	19s
build (stable, thumbv7em-none-eabi)	12s
	5m 36s

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