v4.1.1

• Fixed area overestimating polygons whose holes wind the opposite way to the outer ring, as GeoJSON requires. Holes are now always subtracted, whatever their winding. #64
• Fixed lineSliceAlong with a negative start distance, which produced a slice starting before the line. The start is now clamped to the start of the line. #65
• Fixed insideBBox returning wrong results for boxes wider than 180° of longitude.
• Fixed lineSliceAlong returning NaN coordinates when the stop distance is 0 and the line starts with a duplicate point.
• lineSliceAlong now swaps the start and stop distances if start is greater than stop, matching how lineSlice handles reversed points.
• Fixed lineSlice throwing on a single-point line.
• The CheapRuler constructor now throws on a NaN or non-number latitude.