hybrid-array: simpler `TryFrom` impl (#1015) #1556

Job	Run time
build (1.41.0, thumbv7em-none-eabi)	13s
build (1.41.0, wasm32-unknown-unknown)	15s
build (stable, thumbv7em-none-eabi)	15s
build (stable, wasm32-unknown-unknown)	12s
test (1.41.0)	12s
test (stable)	13s
minimal-versions / minimal-versions	21s
	1m 41s

Provide feedback