hybrid-array: simpler `TryFrom` impl (#1015) #1571

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 23s
test (1.65.0)	1m 25s
build (1.65.0, wasm32-unknown-unknown)	1m 23s
test (stable)	20s
build (stable, thumbv7em-none-eabi)	16s
build (stable, wasm32-unknown-unknown)	20s
	5m 7s

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