Help with change triggering a webhook

Posted on behalf of Christian G. Warden. Original post 2014-07-15

I'm experimenting with webhooks, and I'm trying to trigger an action
when a custom field changes on a task. The change is triggering the
webhook, and I'm getting the new value in the "custom_field_values"
attribute of the JSON that's POSTed, but the "changes" attribute
contains an empty object.

I also noticed that logging time against a task triggered the webhook
with the new "work" value, but the "changes" object was empty in this
case too.

Is this the expected behavior?