Expected Behavior
Activating the onResize options, I'm expecting to get 2 arguments, chart and size as described in doc and types def:
onResize(chart: Chart, size: { width: number; height: number }): void;
Current Behavior
With CHART.JS dist/master, the chart is passed correctly but the size doesn't seem correct.
The size is a proxy and doesn't contain any width or height.
The argument is the chart options instance (maybe I'm wrong).

Steps to Reproduce
See console of https://codepen.io/stockinail/pen/ExgNgXV
Environment
- Chart.js version: dist/master
- Browser name and version: FF 86.0