Behdad Esfahbod 92fd566577 [merge] Use NotImplemented as a singleton meaning "doesn't have" ...

And cleanup recalculate, so we don't accidentally mess something
that is NOT recalculated.

2013-12-19 05:27:53 -05:00

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[merge] Use NotImplemented as a singleton meaning "doesn't have"

2013-12-19 05:27:53 -05:00