indexOf() not working correctly in a changeFn

[nthsense]

doc.list.indexOf("some value") always returns -1, where doc is the first argument of the changeFn passed to handle.change(). I did some digging into proxies.js and I can make no sense of what is going on in the indexOf() implementation there. Workaround for now is to copy the list first... doc.list.slice().indexOf("some value") gives me the correct index.

[acurrieclark]

This is actually an automerge issue, rather than automerge-repo. There is a PR pending for it