[vim/vim] Vim9 union types would be convenient (Issue #18735)

[Brian Carbone]

briancarbone created an issue (vim/vim#18735)

Is your feature request about something that is currently impossible or hard to do? Please describe the problem.
Currently, the only way to represent a union type is with any. A more specific type where each permitted type is separated by | would help a good deal.

Describe the solution you'd like
Built-in vim9 script support for union types. It's not very difficult to represent any other type; product types can be represented using classes that implement multiple interfaces. I suppose an & operator for product types wouldn't hurt, but union types don't really exist in any reasonable form (from what I can tell).

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