Constructing parallel streams

[Brian Goetz]

> And what is the semantics of parallel on an infinite stream, you split
> the infinity ?

It is perfectly sensible.  We can take infinite generators and 
parallelize them easily enough; see the implementation of 
Iterators.spliterator().  The only challenge is "how do you make it 
stop", if you care about that.  Which is why we're talking about 
cancelation.