Standard implementation option (#153) #135

Job	Run time
test (stable)	23s
build (1.61, wasm32-unknown-unknown)	5m 9s
test (1.61)	1s
build (stable, thumbv7em-none-eabi)	17s
build (1.61, thumbv7em-none-eabi)	5m 15s
build (stable, wasm32-unknown-unknown)	17s
	11m 22s

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