• fix ESM build. (#307)
• decouple axis splits filtering from splits formatting (add axis.filter(), axis.grid.filter(), axis.ticks.filter()). (#305)
• fix series.fill for log scales trying to fill to non-existent 0. (#306)
• log base 2 support as axis.log: 10 | 2 (#304): https://leeoniya.github.io/uPlot/demos/log-scales2.html
• fix rounding errors in rangeLog() which threw an infinite loop for values < 1e-3
• some internal cleanup and optimizations