Debounce issue with inline statement handler

[travpeck]

This works:

<input type="text" value="{{ r.value }}" @keyup="updateValue | debounce 500">

But this does not:

<input type="text" value="{{ r.value }}" @keyup="updateValue('test', $event) | debounce 500">

The test inline parameter will display but the $event variable is null. If I remove the debounce filter it will function as expected.