Boro Sitnikovski

If `isset($arg[10])` is true, it doesn't imply that `isset($arg[5])` is also true: ``` php > $x = [10 => 1]; php > var_dump(isset($x[10])); bool(true) php > var_dump(isset($x[5])); bool(false) ```

Hi @rlanvin, this is great, thanks for your work. However, I found an issue with the `proxy` branch. Please refer to the [following example code](https://gist.github.com/bor0/4154eca676efe1b7192ae8804df7b89d). We're setting two events there:...

@rlanvin I gave this another try, seems to be working fine! I had an error in my implementation. I updated the Gist and it works fine. Any chance of merging...