Sized

[Brian Goetz]

> I still think the only way out is to introduce a new method
> with long return type. We could even do it while keeping the name
> Sized, but leaving the size() method alone for continued use in
> Collections-only applications, and defaulting the new method in
> Collection:

OK, but...

> public interface Sized { // or pick a new name
>      /**
>       * Returns the number of elements
>       */
>      long elementCount(); // oh no, another arbitrary name choice
>
>      default boolean isEmpty() { return elementCount() == 0; }
> }
>
> interface Collection<E> extends Sized ... {
>    default long elementCount() { return (long)size(); }
>    ...
> }

...why would you have the new method not return the actual size, rather 
than the clamped size returned by size()?