Feedback #1
Description
I like the generic approach giving a common interface to all these types. There are certainly features that could be added to each type. Let's take date/time where we have many different formats or values to convert between like Unix time/epoch or iso. It might be better design to not have a common super class but just the same interface. Keep the classes as generic as possible (like the new Js Temporal).
Over time more type specifics can be added and there will be less in common. Anyway, great start and I'm looking forward where this project will go 👍