amCharts 4 - valueAxis Tooltip Precision Too Low

Question

See this pen. The valueAxis has a maxPrecision of 8 and number formatting to allow 8 significant digits:

valueAxis.maxPrecision = 8;
valueAxis.numberFormatter = new am4core.NumberFormatter();
valueAxis.numberFormatter.numberFormat = '0.00000000';

However, the valueAxis tooltip only seems to show 4 significant digits. The data has 6.

How can I set the valueAxis tooltip to have a precision of at least 6?

Answer 1

You can do

valueAxis.extraTooltipPrecision = 2;

to add two significant digits.