How do I cleanup functionality enabled through the play function?

[lancegliser]

The new play function provides a means of interacting with canvas and enables with testing. It might not be a direct requirement of testing to have a cleanup function, but I do end up needing one.

I've got one story that's about continuous animation. Zoom in, Zoom out (based on hover from an external component that controls a prop) on loop to get the feel for timings and demonstration. In order to do that, the most simple implementation is setInterval. Mirroring React's handling, I immediately went to return a function the play function could run when it unloaded. It doesn't take one though.

How should I cleanup after my play function? Do I need to? Might need to at least expand documentation, if not a minor feature.