Count rather than Count<T>

I haven't yet found a use case for the generic type parameter of `Count<T>`. It might be simpler to just omit `<T>` since the bit count of every binary integer is limited by the pointer-bit version: `Count<IX>`. I feel like it's more common for the compiler to complain that it doesn't know the type of `<T>`. I could write a protocol for it, if I ever need multiple such types. Hm.
