Change in default xml, rjs respond_to templates that Rails looks for on edge Rails

Not sure if this is the right avenue to discuss this but I couldn't find anywhere to ask this question on Rails Trac.

Regarding this latest changeset:   http://dev.rubyonrails.org/changeset/6507 (Change default respond_to templates for xml and rjs formats.)

Does anyone know the rationale behind it? I can imagine there would be an announcement in the future about this backward compatibility breaking change, but I am living on the edge for one of my projects so I'm curious.

Also, if any Rails committers see this, maybe you can consider making it fallback to the old defaults and (throw a deprection warning) if the new defaults can't be found so that there is no need to either rename the RJS templates or tell Rails which template to use (using render :action => "#{action_name}.rjs")?

Thanks!