PerformableMethod has a reader method #method which overrides Object#method.

Normally, this is not a problem, but if you mixin a failure hook into the PerformableMethod class, when the hook procedure tries to call Object#method on the payload_object (to determine it's arity), it raises a NameError when the payload object is a PerformableMethod.

I know that augmenting PerformableMethod isn't really part of the API, but I imagine that you're planning on adding an interface for adding failure hooks for method.delay, since creating a custom job class for every method you desire to have a failure hook is a little cumbersome.

I had a branch cooking that fixed the issue by renaming PerformableMethod#method to #delayed_method (overriding the core #method was a poor choice IMHO), and was starting on an API for adding custom failure methods via inline Procs or Modules: method.delay(:failure => lambda {}).method(args)

However, you have been busy recently! delayed_job is undergoing a major overhaul and my branch has become a mess to integrate. So instead of trying to read your mind, I'd like to ask if you could resolve this issue.