I mean, a heterogeneous list is literally a list where its elements may be of different types. To use a tired example, if a list that contains both a Cat and a

I mean, a heterogeneous list is literally a list where its elements may be of different types. To use a tired example, if a list that contains both a Cat and a Dog is not heterogeneous just because both adhere to the Mammal interface, then what is a heterogeneous list?