* passing union args per serde scope to rendered union function
* spliting is_instance into multiple functions & rendering the correct one will be faster

* is_instance takes some shortcuts to increase performance, like only checking the 1st element of lists
* typecheck was only used in tests

To be more performant we just try to deserialize instead of checking types, this means the order of types in unions is important. More complex types should be tried first, otherwise simple types will prematurely  match.

* use a typed dataclass as container for serde internals
* removed more_types.py & the custom serializer code. Unkown type exception has now own function.

class inheritance caused overwriting of scope values

thanks tomlfile example, otherwise I had not noticed it