hybrid-array: looser `Debug` impl on `Array` (#941) #1466

Job	Run time
build (1.56.0, thumbv7em-none-eabi)	2m 34s
build (1.56.0, wasm32-unknown-unknown)	3m 13s
build (stable, thumbv7em-none-eabi)	30s
build (stable, wasm32-unknown-unknown)	29s
test (1.56.0)	2m 33s
test (stable)	30s
minimal-versions / minimal-versions	31s
	10m 20s

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