compare ring sum within epsilon of 1

fixes #1661
closes #1662

Changelog.md

@@ -14,6 +14,10 @@ IE is no longer supported. dc.js will not support transpilation. Stick with dc@3
 
 The API is mostly compatible, but there are a few breaking changes - see the [v4 upgrade guide](https://github.com/dc-js/dc.js/blob/develop/docs/dc-v4-upgrade-guide.md) for details.
 
+## 3.2.1
+* Fix rounding issue with equal ring sizes, by hofmeister ([#1662](https://github.com/dc-js/dc.js/pull/1662) /  ([#1661](https://github.com/dc-js/dc.js/issues/1661))
+
+
 ## 3.2.0
 * Support for general customizable ring sizes on the sunburst chart, by hofmeister ([#1625](https://github.com/dc-js/dc.js/pull/1655) /  ([#1511](https://github.com/dc-js/dc.js/issues/1511))
 * Sort sunburst wedges according to `baseMixin.ordering()`, by hofmeister ([#1625](https://github.com/dc-js/dc.js/pull/1655) /  ([#1511](https://github.com/dc-js/dc.js/issues/1511))

src/charts/sunburst-chart.js

@@ -449,7 +449,7 @@ export class SunburstChart extends ColorMixin(BaseMixin) {
             }
 
             const portionsSum = d3.sum(relativeSizes);
-            if (portionsSum !== 1) {
+            if (Math.abs(portionsSum - 1) > dc.constants.NEGLIGIBLE_NUMBER) {
                 throw new BadArgumentException(
                     `relativeRingSizes : portions must add up to 1, but sum was ${portionsSum}`);
             }