v2.0.0

2.0.0 (2026-11-12)

Highlights

A ground-up rewrite for .NET 11 and C# 15 unions. The 1.x line is retired.

• Maybe<T> is a C# 15 union with exactly two cases, T and None: values convert implicitly, a switch over
  both is exhaustive, and pattern matching works in generic code too.
• No invalid states: default(Maybe<T>) is None, a null never becomes a value, and there is no .Value or
  any other throwing accessor.
• Functional API: Match, OrDefault, Map, Bind, Filter, OrElse, Zip, Fold, Iter, Tap,
  Flatten, and query syntax (from, where, let, select).
• Collections and interop: Choose, Traverse, Sequence, FirstOrNone, SingleOrNone, GetValueOrNone,
  FromNullable, ToNullable and Maybe.Parse<T>.
• Ordering like Option in F# (None first), with no </> operators on purpose.
• System.Text.Json without configuration: a value is written as itself and None as null. Works with
  source-generated contexts.
• Async: *Async counterparts returning ValueTask, plus pipelines and query syntax over Task<Maybe<T>> and
  ValueTask<Maybe<T>> with a single await.
• Zero allocations for value-type T (checked on every build); trimming and Native AOT compatible.
• Requires .NET 11.

Performance Improvements

• allocate nothing in async queries with two from clauses (590045a)