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Changes between Initial Version and Version 1 of Ticket #46635, comment 18

initial	v1
2	2
3	3	- Yes, the `RemovableClosure` is a `callable` to PHP, so it will just behave as a regular Closure, or any other callable.
4		- We can still provide a convenience function, like `add_closure_action( $hook, $id, $closure, $priority, $num_args )` to hide the object instantiation. This can be ~~then~~ without BC break.
	4	- We can still provide a convenience function, like `add_closure_action( $hook, $id, $closure, $priority, $num_args )` to hide the object instantiation. This can be done without BC break.