We need to test if the same method defined more than once only register
one subscriber for it. We can safelly remove because the method body is
the same and Subscriber use method_added hook for register the
subscriber.
Before, you were required to attach *after* adding the methods to the
class, since the attachment process needed the methods to be present.
With this change, any new method will also be attached to the configured
namespace.
Matthew Draper