I'm partial to array backed objects where applicable. But I've never actually tried a blessed code ref... until 5 minutes ago after reading your reply! It might be a good solution to my application.
Out of interest, do you have insight on how perl knows to call the underlying code ref and not a method that may or may not be in the package? An extra lookup/check must be done when called?
$code_ref_obj->();#calls code ref directly
$code_ref_obj->a_method(); #Call a method on the object
Thanks again for you comments