Post #4211897

#RocketLang update: I added support for "Union types": You can now declare variables (and function parameters of types like `int32 | None`. The variables can hold values of both types (and functions can be called with parameters of both types).the functionality is still a bit rough around the edges (not as comfortable to use as I'd like), but the core functionality is there. This is actually on the "critical path" towards my current goal of implementing a unit testing library: When discovering tests (iterating through folders, finding test files, loading them and then finding the test cases in them), I need a *list* of test-cases. Currently only `ArrayList`s are (kind-of) implemented. But they require... arrays - and if a type doesn't have a default value, you can't initialise the array. Concretely: When I'm building a list of test cases, that's a `ArrayList[func() -> None]`. But `func() -> None` doesn't have a default value, so creating a `RawArray[func() -> None]` fails, so there's no list. Now, with union types I can create an `ArrayList[func() -> None]` that uses a `RawArray[(func() -> None) | None]` as backing storage.