Fix IsMoreThanNthGenerationDescendantOf.init_list() typing

[stevenyoungs]

The person argument of IsMoreThanNthGenerationDescendantOf.init_list() is typed to expect a Person
From IsMoreThanNthGenerationDescendantOf.prepare() a parameter of type DataDict | None was passed.
From within IsMoreThanNthGenerationDescendantOf.init_list a recursive call is made passing a Person object.

Unify so that the parameter always has the type DataDict | None

[Nick-Hall]

Most of the filter init_list methods seem to take a primary object rather than a DataDict. Have look at the init_list method in the IsLessThanNthGenerationDescendantOf rule.

I think that we should leave this until v6.1 unless there is a real bug associated with it.

[stevenyoungs]

Most of the filter init_list methods seem to take a primary object rather than a DataDict. Have look at the init_list method in the IsLessThanNthGenerationDescendantOf rule.

I chose to standardise on DataDict as it will be lightly faster.
I think init_list is an internal method so we do not need to be consistent across the different classes. In this class a DataDict is sufficient. In other filters, the true object may be required.
There's a general decision to be made here. A DataDict and the true object are designed to be interchangeable. As typing is introduced we need guidance on what pattern to follow in situations where a DataDict provides sufficient functionality:

• person: Person
• person: DataDict
• person: Person | DataDict

The last option offers the most flexibility, allowing the calling code to provide whichever type is most convenient, at the expense of a little more typing when defining the method.

I think that we should leave this until v6.1 unless there is a real bug associated with it.

Agreed. So long as we do not make any other code change that exposes the lint error in 6.0, no need to fix in 6.0.

[dsblank]

If we make Person be a protocol (like we're thinking Database should be) then that might work. Unless one is importing both gen.lib.Person and a new typing.Person. I guess they might need different names.