How to setup a single route with optional argument

The relationship between multiple segments and parameters with (:any) is odd to me, but it is a specification.
See https://codeigniter4.github.io/CodeIgnit...ior-of-any

If you want to catch all segments, use the syntax ...$params

If I could fix it, I would, but changing the behavior would be a breaking change,
so it is not easy to change.

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