Fix d3.svg.axis such that: the “tick” class is applied to the g element, rather than the line; the domain path is properly entered when called via transition; and an invalid orientation is treated as "bottom".
Fix selection.sort such that null nodes are placed at the end, rather than passing undefined to the comparator.
Fix force.linkDistance and force.linkStrength such that they return a constant value if the link distance or strength is specified as a constant value, rather than returning a function; fix force.drag such that a drag behavior is properly instantiated when called with no arguments, and any additional set fixed bits are preserved on mouseup or mouseout.
Fix d3.geom.voronoi to workaround Prototype’s broken implementation of array.filter.
Fix d3.format and d3.formatPrefix to use MICRO SIGN (µ) rather than GREEK SMALL LETTER MU (μ), and fix the rounding specifiers "p" and "r".
Fix d3.behavior.zoom’s detection of wheel event support, and increase speed for browsers that do not support wheel events.
Optimize d3.random.logNormal.
Optimize d3.geo.area.
Capture references to the d3 namespace, the current document and the current window, rather than rely on globals; allows multiple versions of D3 to be loaded independently.