feat: Replace `Tuple` with unary sums #34

Job	Run time
Check for changes in Rust files	6s
check	1m 15s
tests (Rust stable)	1m 53s
benches	2m 6s
tests (Rust 1.75)	1m 43s
tests (Rust beta)	1m 51s
tests (Rust nightly)	1m 54s
Required checks 🦀	1s
coverage	2m 28s
	13m 17s

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