Michael Schimmel
807903efbb
Introduces `StaticType::Optional` to represent values that can be either of a specific type `T` or `Void`. This is crucial for handling situations in filter pipes where an expression might not always produce a value. The type checker now correctly deduces and propagates this `Optional` type, and the pipeline operator (`pipe`) is updated to unwrap `Optional(T)` results, yielding `T`. This ensures that the type system accurately reflects the potential absence of values in intermediate pipeline steps. Also includes a minor rename in the tuple-struct example from `pipe` to `p` for clarity, and registers the `streams` module.