As alluded to in an earlier email today[1] I am now moving the Union
Types RFC[2] to the discussion phase. The short summary of the RFC is
that it permits a type declaration to be one of several enumerated
types. For example, this is a potential signature for a multi-type map
routine:
function map(callable $f, Array | Traversable $iterable);
The second parameter `$iterable` is required to be of type Array or
Traversable - any other type will error.
I look forward to a helpful and meaningful discussion!
[1]: http://news.php.net/php.internals/92252
[2]: https://wiki.php.net/rfc/union_types
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