--- /dev/null
+- Rectify the various function signatures of valueFormatter and axisLabelFormatter
+
+- Update all options in the options-reference:
+ - xValueFormatter
+ - pixelsPerXLabel
+ - xAxisLabelFormatter
+ - xTicker
+ - yValueFormatter
+ - pixelsPerYLabel
+ - yAxisLabelFormatter
+ - yTicker
+ + valueFormatter
+ + ticker
+ + axisLabelFormatter
+ + pixelsPerLabel
+
+- Write per-axis.html explaining how this works.
+
+- Write some (non-auto) tests