SciTools/iris — pull request #1093 by cpelley (2014-04-10 12:09:26+00:00)
Title: BUG: Removed cause for increased interpolation error.

Applicable to modifying the range of supplied points so that they are
wrapped to the source points range. Resulted in values to be
interpolated over being slightly different. This difference becomes
amplified when interpolating values which are then different on a high
gradient.