spark.default.parallelism's default is inconsistent across scheduler backends

The 0.7.3 configuration guide says that spark.default.parallelism's default is 8, but the default is actually max(totalCoreCount, 2) for the standalone scheduler backend, 8 for the Mesos scheduler, and threads for the local scheduler:

https://github.com/mesos/spark/blob/v0.7.3/core/src/main/scala/spark/scheduler/cluster/StandaloneSchedulerBackend.scala#L157
https://github.com/mesos/spark/blob/v0.7.3/core/src/main/scala/spark/scheduler/mesos/MesosSchedulerBackend.scala#L317
https://github.com/mesos/spark/blob/v0.7.3/core/src/main/scala/spark/scheduler/local/LocalScheduler.scala#L150

Should this be clarified in the documentation? Should the Mesos scheduler backend's default be revised?