mbostock/d3 — pull request #1804 by mbostock (2014-03-23 00:19:07+00:00)
Title: Clamp latitude for conic conformal projection.

The Lambert conic conformal projection extends to infinity along the outer edge of the projection, and thus the latitude must be clamped either at -π/2 or +π/2 depending on the parallels. Fixes #1802.