Allow prefix class types as arguments for transient-scope

[aurtzy]

Would it be a good idea to allow prefix classes/types as arguments in addition to a specific command (or list of)? My concern is that it is not straightforward to extend if I want other prefixes (not necessarily defined in the package) to be accepted as well.

For example, I have defined a prefix class with a custom transient-init-scope method. The expectation is that any prefixes of this class/type will use the format from this transient-init-scope. It thus seems desirable to allow transient-scope to return a non-nil value if a prefix matches that type.

Alternatives for this use case that don't require changing the current implementation:

• Define a list variable for "compatible prefixes" that can be added to by the user or external packages.
• It might also work to add some hook/method-with-qualifier to the prefix class that automatically does this.