fix!: Combine `ConstIntU` and `ConstIntS` #254

Job	Run time
Check for changes in Rust files	6s
check	1m 6s
tests (Rust stable)	2m 5s
benches	2m 11s
tests (Rust 1.75)	1m 39s
tests (Rust beta)	1m 39s
tests (Rust nightly)	2m 9s
Required checks 🦀	1s
coverage	2m 3s
	12m 59s

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