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Remove `opaque-debug` and `collectable` #1166

Job	Run time
build (1.85.0, thumbv7em-none-eabi)	16s
test (1.85.0)	18s
build (stable, wasm32-unknown-unknown)	20s
test (stable)	45s
build (stable, thumbv7em-none-eabi)	16s
build (1.85.0, wasm32-unknown-unknown)	17s
minimal-versions / minimal-versions	32s
	2m 44s

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