• Add formatNumber. #2078
• Add numberInterval, timeInterval, and utcInterval. #2075
• The tip mark’s format option now applies to the title channel. #2053 #2074
• The log scale’s tickFormat option, when a function, now applies only to labeled ticks. #2077 #2078
• Improve the robustness of barycentric interpolation. #2025 #2037
• Fix scale inversion when the domain is collapsed. #1985 #2027
• Fix the plot’s initial value when using the pointer transform and a figure. #2045 #2046
• Fix a crash when the stack transform is used with mixed faceting. #2016 #2028
• Fix the coercion of null when using the percent scale option. #2072 #2073
• Fix side effects declaration so Rollup doesn’t drop Mark.prototype.plot. #2069

Thanks to @pearmini for contributing to the docs!

Full Changelog: v0.6.14...v0.6.15