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Mike Bostock authored
When computing the midpoint between two points both at longitude -π, there was a chance that atan2 would return +π rather than -π. Now, we check whether the points to interpolate lie (approximately) on a meridian; if they do, we can approximate by using linear interpolation of longitude rather than atan2. This fixes #1635 which was caused by new trig implementations in Chrome Canary.
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