feat: Replace `Tuple` with unary sums #36

Job	Run time
Check for changes in Rust files	6s
benches	1m 5s
tests (Rust 1.75)	1m 11s
tests (Rust stable)	1m 13s
tests (Rust beta)	1m 9s
check	57s
tests (Rust nightly)	1m 17s
Required checks 🦀	1s
coverage	1m 42s
	8m 41s

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