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Remove never crate and switch to Infallible type #299

Job	Run time
build (windows-latest, nightly)	45s
build (macOS-latest, beta)	27s
build (ubuntu-latest, 1.83.0)	22s
build (ubuntu-latest, beta)	18s
build (ubuntu-latest, nightly)	21s
build (macOS-latest, nightly)	28s
build (macOS-latest, stable)	23s
build (macOS-latest, 1.83.0)	27s
build (ubuntu-latest, stable)	23s
build (windows-latest, beta)	43s
build (windows-latest, 1.83.0)	46s
build (windows-latest, stable)	50s
	6m 13s

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