Unfortunately, `Em.run.once` doesn't work, and I'm not entirely sure why.
I get this "willCommit while saved" ember-data error (http://cl.ly/image/2F1Z0Z0Y2Z0X) when using it instead of debounce. It seems like they should be identical.

The action handler must get called in two separate run loops, then? (But somehow in the same frame, since a debounce with 0ms fixes it?)