Thanks. It's definitely not obvious to me coming from Java/c++/python. I think I went into the deep end with some non trivial generic functions. It's been a fe

Thanks. It's definitely not obvious to me coming from Java/c++/python. I think I went into the deep end with some non trivial generic functions. It's been a few months, but I remember ditching interfaces for classes so I could do some run time type checking. I wouldn't have fallen into these traps with something like Java.