v4.4.0

• Add identity.reflectX and identity.reflectY to d3.geoIdentity.
• Add zoom.interpolate to control zoom transition behavior.
• Allow double-click and double-tap zoom transitions to be disabled.
• Fix handling of a zoom.translateExtent smaller than the zoom.extent.
• Fix handling of zero-valued nodes in squarified treemaps.
• Fix parsing of unusual number formats in color specifications.
• Fix implementations of force.initialize to allow isolation.
• Fix d3.geoPath’s default projection and contex to be null, not undefined.
• Improve performance of d3.path.