Result.Validate(r1, r2, ..., mapper) — applicative validation; runs 2/3/4 independent Result<T> validations simultaneously, accumulates ALL errors (no short-circuit), maps heterogeneous success values via typed mapper func to Result<TResult>
Result<T>.Deconstruct() — C# 8+ tuple syntax; var (value, errors) = result and var (isSuccess, value, errors) = result for Result<T>; var (isSuccess, errors) = result for non-generic Result
Maybe<T> ↔ Result<T> interop — maybe.ToResult(errorFactory/error/string) bridges None to typed failure; result.ToMaybe() discards errors and returns Some(value) or None