Derive concrete type from generic type.

Say I wanted a collection of Field objects, but with some extra
functionality, say constraints on how fields can be added.  I decided
List<Field> is a good fit for most requirements, but want to derive a
MyFieldList.  To the best of my limited generics knowledge, I have to derive
a MyFieldList<T> anyway, but all my refinements in the child class only
refer to type Field, so the generic parameter is basically redundant.  Is
there any way around this?


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