When a DomCrawler\Form is initialized with an <input type="image" name="bar"> element, it will end up in $form->getValues() as "bar", instead of "bar.x" and "bar.y". Because of this, there is no way to set the values for the x and y coordinates and it will incorrectly miss those variables in the GET/POST data, would the form be submitted.

Ran into this issue while using fabpot/Goutte, where my submitted form did not get picked up properly by the receiving webserver, because the "imageinputname".x and "imageinputname".y were not present in the POST data.