Hi!
1) With the interface, the prototype is fixed.
That definitely would not work. Interface could leave __invoke undefined, though then it'd be more of documentation/attribute purpose than enforcing having __invoke. But it can be workable.
However, I'd still like to make closures more flexible and internals-friendly by implementing zend_get_closure as a handler.
Hmm... it may work, at least at the first glance I don't see any trouble with it.
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