v2.10.0

• Add d3.InternMap.
• Add d3.InternSet.
• Change d3.group, d3.rollup et al. to use InternMap.

v2.9.1

• Fix last bin with d3.bin when the values are not numbers.
• Fix last bin with d3.bin when the tick increment is fractional.

v2.9.0

• d3.sort now may accept an accessor. #183
• Fix zero-width last bin with d3.bin. #177

v2.8.0

• Add d3.nice.
• Add d3.every.
• Add d3.some.
• Add d3.filter.
• Add d3.map.
• Add d3.reduce.
• Add d3.reverse.
• Add d3.sort.
• Add d3.difference.
• Add d3.disjoint.
• Add d3.intersection.
• Add d3.superset.
• Add d3.subset.
• Add d3.union.
• Fix d3.bin to nice the domain by default, ensuring uniform bin widths.

v2.7.1

• Fix imprecision with bin.thresholds(count). #169

v2.7.0

• Add d3.bisectCenter. #138
• Add d3.shuffler. #167
• Fix off-by-one with hi in bisector.center.

v2.6.0

• Add d3.index.
• Add d3.indexes.
• Add bisector.center.

v2.5.1

• Fix: d3.ticks sometimes incorrectly returned ticks outside the domain (#162)

v2.5.0

• Add d3.fsum.
• Add d3.Adder.

v2.4.0

• Add d3.cumsum. Thanks, @Fil! #102