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• Don't consider (1) since it is covered by (2) and (4)
• Try (2) because it is easy (although not completely elegantideal, e.g. because of hardwired number of Reduce calls)
• Try (3) because it is the easiest way to allow legion implementation of mtip.  Note that this is separate from the callback-approach that Seems is supporting.  So callbacks are still necessary.  The need for the two different approaches is not ideal.
• Use (4) as a backup plan if (2) runs into trouble, since (4) is more effort.

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