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Internals,
As alluded to last week I have another RFC for improving the type
system: [intersection types][1].
It allows parameters to define multiple type constraints that must be
satisfied. Common combinations of our built-in types include
ArrayAccess & Traversable & Countable and Countable &
Iterator.
Some people have suggest I merge this and union types into one RFC.
For now I'll just proceed with them separately to gain feedback.
[1]: http://wiki.php.net/rfc/intersection_types