documentcloud/cloud-crowd — comment on commit 0f63d04a2ae2c9b0c904cde984d6defa8b302a6a
File:  line 0
By knowtheory:

Using priority_rank over priority to provide sensible default semantics. The closer to 0 a job is, the more important it is. 0 is set as the hard upper limit, rather than asking users to pick an arbitrary integer point as most important. Jobs default to priority rank 1 if not otherwise specified, leaving an open slot for jobs of priority rank 0 to be inserted in the queue.