refactor!: make functions infallible where possible #255

Job	Run time
check_features (ubuntu-latest)	37s
check_features (macos-latest)	2m 0s
clippy (ubuntu-latest)	1m 3s
test-windows	3m 22s
clippy (macos-latest)	1m 29s
integration-tests (ubuntu-latest)	2m 22s
rustfmt (ubuntu-latest)	8s
integration-tests (macos-latest)	1m 50s
tests (ubuntu-latest)	2m 6s
rustfmt (macos-latest)	28s
tests (macos-latest)	1m 39s
all-systems-go	1s
	17m 5s

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