Just a quick thought.
union Iterable {
use array;
use ArrayAccess;
use Traversable;
}
function bla(Iterable $iterable) {
foreach($iterable as $element) {}
}
Primitives like string, float, bool or int are not allowed in union.
Only classes, interfaces and array. I doesn't see any benefit in
combining string with int or int with float in one union.
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