toArray

[Brian Goetz]

Seems that the minimally invasive version of toArray (that doesn't 
propagate the horrible convention established by Collection, and yet 
doesn't foist Object[] on users) is:

   interface Stream<T> {
       Object[] toArray();
       T[] toArray(Class<T> clazz);
   }

It is unfortunate to need the Object[] version at all.  However, code 
that is generic in T might be passed a Stream<T> and not know what class 
literal to use.  It is further unfortunate that we cannot say

   <S super T> S[] toArray(Class<S> clazz)

as then such code could say toArray(Object.class), but we cannot (this 
is a limitation of generics.)