It's unclear if the Task Status table (http://hl7.org/fhir/R4/valueset-task-status.html) in section 3.4 of the Specification page is the only set of allowable combinations or not. The value set associated with Task.status contains values not in the table (things like draft, requested, failed). Are these valid statuses? If so, some description of when to use them would be helpful. If not, they should be removed from the value set.