toArray (was: Migrating methods in Collections)

[Brian Goetz]

Doug pointed out something to me today that hadn't occurred to me -- 
that callers of Collection<int>.toArray() might actually *want* an 
Object[], not an int[].  Does anyone have opinions on usages that would 
inform this one way or the other?

Now that we have streams, we can easily get both:

     Collection<int> c = ...
     c.stream().toArray()   // int[]
     c.stream().boxed().toArray()  // Object[]
     c.stream().boxed().toArray(Integer[]::new)  // Integer[]

So it would even be possible (though a little weird) to completely punt 
on migrating toArray() and tell users to go through streams if they want 
an array.