How to match and use `P.select()` on recursive data structures?
I'm enjoying the power and expressiveness of this library - thanks for creating and maintaining it! A problem I have run into is that it's not clear to me how to match against a recursive object - especially when I want to use `P.select` to select values.
Example:
```typescript
type A = {
kind: 'a',
value: string
child: A | B
}
type B = {
kind: 'b',
value: string
}
const a: A = {
kind: 'a',
value: 'hello',
child: {
kind: 'a',
value: 'world',
child: {
kind: 'b',
value: '!'
}
}
}
```
In this example, the object I want to match against (`a`) could have an arbitrary depth. I want to use `P.select` to select the `value` throughout the entire object regardless of it's shape.
(Note in this specific example I could just walk the tree but our project has multiple complex data structures we need to match against).
Is this possible with this library - if not, is there a recommended approach here? Thanks!
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