Closed interval set: disjoint unions of closed intervals

Real documentation on docs.rs.

There's a plethora of crates that manipulate sets of values represented as sets of intervals. This crate targets what appears to be a gap in the current (February 2025) offering:

1. Support for all standard machine integer (include 128-bit integers) as endpoints
2. Ability to represent the universe [T::MIN, T::MAX]
3. No unchecked overflow

The closed-interval-set crate offers all that, for arbitrary types that implement its Endpoint trait, and comes with an implementation of that trait for the 12 standard integer types, as well as for 32 and 64 -bit floats.

The crate is designed for usage patterns where sets are constructed ahead of time (perhaps by combining different sets together), then frozen (as SmallVec<[(T, T); 2]>, internally) for read-only access. However, its iterator implementations of set complementation, union, and intersection are closed over the NormalizedRangeIter trait, so it's feasible to build up complex, even type-erased, expression before materializing the result to a RangeVec.

Related crates

normalize_interval : same idea of normalizing integer ranges to closed intervals.

Many crates can handle the more complex case where we wish to track overlapping ranges individually (e.g., iset, or nested_intervals).

The range-set-blaze is similar to this crate, and intervallum even closer, but neither handles the full range of u128 or i128.