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Refactor slicing API to not require copying #1789

Job	Run time
Tests / cargo-clippy	38s
Tests / amd64-linux-gnu compiler	56s
Tests / amd64-linux-musl compiler	1m 45s
Tests / cargo-deny	28s
Tests / cargo-fmt	19s
Tests / vale	8s
Tests / amd64-freebsd-native compiler	2m 19s
Tests / amd64-mac-native compiler	1m 34s
Tests / inko-fmt	59s
Tests / arm64-mac-native compiler	1m 1s
Tests / amd64-freebsd-native std	4m 59s
Tests / amd64-linux-gnu std	1m 41s
Tests / amd64-mac-native std	2m 24s
Tests / amd64-linux-musl std	2m 29s
Tests / arm64-mac-native std	1m 26s
Tests / amd64-linux-gnu std --release	2m 8s
Tests / amd64-linux-musl std --release	3m 2s
Tests / amd64-mac-native std --release	2m 41s
Tests / arm64-mac-native std --release	1m 36s
Standard library documentation	0s
Nightly container	0s
Documentation	0s
	32m 33s

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