Module Queue.ServiceSource

This is the description of a job. A job dispatch is a job description and some arguments/input.

A workable job can process a job instance that is persisted. We can not store the job directly because of the polymorphic type ('a Job.t).

This is the actual job instance that is derived from the job description 'a Job.t and some input. This needs to be serialized and persisted for persistent job queues.