Pie - Manually toggling data points selection results in invalid selectedDataPoints array

[tommitch]

Codepen

Codepen to demonstrate the problem

Click the "manually toggle" button and watch the console output

Explanation

• What is the behavior you expect?
  The selectedDataPoints array should contain an up to date list of the currently selected data points when toggled using the toggleDataPointSelection method.

• What is happening instead?
  The selectedDataPoints is being filled with NaN on every click.