Generics

[beattyml1]

Like Range<Date> or Range<number>

[beattyml1]

The Minimum Loveable Feature is probably a generic that accepts a single type param where that type param can only be set on the field. The long term ideal would also be able to set type params for the parent types on a type and to be able to set multiple. This should be approached such that getting the MLF done quickly is a priority but it is done in a way that doesn't make the long term vision harder and if we can do more than the MLF easily we should