+ * Get "root job" parameters for a task
+ *
+ * This is used to no-op redundant jobs, including child jobs of jobs,
+ * as long as the children inherit the root job parameters. When a job
+ * with root job parameters and "rootJobIsSelf" set is pushed, the
+ * deduplicateRootJob() method is automatically called on it. If the
+ * root job is only virtual and not actually pushed (e.g. the sub-jobs
+ * are inserted directly), then call deduplicateRootJob() directly.
+ *