Destroying the workflow causes the zoom plugin to crash

[multimeric]

If you run the following code twice, with a workflow that uses the ZoomPlugin, a JavaScript error will occur and the workflow will fail to render.

workflow.destroy();
workflow.draw(model);

The error is:

zoom.js:45 Uncaught TypeError: this.dispose is not a function
    at ZoomPlugin.destroy (zoom.js:45)
    at workflow.js:403
    at Array.forEach (<anonymous>)
    at Workflow.invokePlugins (workflow.js:401)
    at Workflow.destroy (workflow.js:323)
    at HTMLInputElement.<anonymous> (index.js:29)

A minimal example of this behaviour can be found here: https://github.com/TMiguelT/CwlSvgZoomBug