Primitive streams and optional

[Remi Forax]

On 11/24/2012 06:13 PM, Doug Lea wrote:
> Summary: get rid of Optional. Use null consistently to mean nothing
> there (plus exceptions in exceptional cases). Use the standard boxed
> types for numerics. Until/unless there is are value types, create
> intStream etc as a separate set of classes with merely analogous APIs.
> (And while we are at it, add LongKeyHashMap and a few others!)
> Don't worry about people who used null as "meaningful" elements, map
> keys or map values.  No one is forcing them to use streams.
>
> -Doug
>

Just to be crystal clear, I disagree with Doug that stream should throw 
a NPE in middle of it's implementation, if an item of a collection is 
null or if a lambda returns null, but I agree with him that the external 
API should not use Optional and use null to say nothing.

Rémi