const fn saturating_add_signed(lhs: u64, rhs: i64) -> u64
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NOTE: Mixed integer ops currently not stable, so copying the impl.
- https://github.com/rust-lang/rust/issues/87840
- https://github.com/a1phyr/rust/blob/47edde1086412b36e9efd6098b191ec15a2a760a/library/core/src/num/uint_macros.rs#L1039-L1048