delete doesn't trigger recomputation

[boris-petrov]

Reproduction.

Clicking the button sets a tracked object's property to something and clicking it a second time does a delete. That should hide some text that is shown and should log undefined. Neither happens. I think this is a bug.

[lifeart]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/deleteProperty should fix issue for objects

[boris-petrov]

@chriskrycho - now that I think about this, why did you mark this issue as closed? I keep looking at that PR and I see nothing related to it. You can see the two unmerged PRs - they add a deleteProperty handler to the Proxy - and I believe that's the only way to fix this issue.

[chriskrycho]

Just typo'd which issue it was supposed to resolve!