v6.0.0

What's new in v6.0

Value sets — a second type family. The package's model was never "ranges" narrowly; it is immutable, canonical-at-construction value domains with PostgreSQL-native storage shapes. RangeSet has embodied "canonical set with a native store shape" (multirange) since v2; v6 applies the same concept one level down: canonical sets of scalar values, stored as native PostgreSQL arrays (text[], uuid[], integer[], …) — deduplicated, sorted, structurally equal, with the membership algebra PostgreSQL's own array operators speak.

• Ten closed types in the core package — StringSet, GuidSet, Int16Set, Int32Set, Int64Set, DecimalSet, DateSet, TimeSet, DateTimeSet, DateTimeOffsetSet — plus validated-wrapper arities StringSet<T>, GuidSet<T>, Int32Set<T>, Int64Set<T> for generator-produced domain values (Vogen, Metalama aspects, StronglyTypedId, hand-written wrappers), constrained only on BCL interfaces so domain types never reference this package. See Value Sets.
• Five NodaTime types in the satellite: LocalDateSet, LocalDateTimeSet, InstantSet, LocalTimeSet, and the month-granularity YearMonthSet (stored as a month-aligned date[], like YearMonthRange's daterange).
• Membership algebra — Contains, Overlaps, IsSubsetOf, IsSupersetOf, IsProperSubsetOf, IsProperSupersetOf, Union, Remove, Count, IsEmpty (plus client-side Intersect/Except/Add) — PostgreSQL array literals ({a,b}), JSON support through the existing converter factory, and collection expressions (StringSet tags = ["a", "b"];).
• The EF Core packages map them by convention to native array columns — no configuration, no registration, wrapper instantiations recognized automatically — with LINQ translation to the array operator algebra (@>, &&, <@, cardinality, array_cat, array_remove). Containment always translates as @>, so a plain GIN index serves it. See Value set columns.

v6.0 contains no breaking changes; the major marks the package growing a second type family.