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Instead of having a completely independent encoding for type list entries. This is going to use more memory, but I'm not particularly concerned about that, as type unions that contain multiple classes should be uncommon. On the other hand, this allows us to treat top-level types and types inside lists mostly the same. A new ZEND_TYPE_FOREACH macros allows to transparently treat list and non-list types the same way. I'm not using it everywhere it could be used for now, just the places that seemed most obvious. Of course, this will make any future type system changes much simpler, as it will not be necessary to duplicate all logic two times.