Ion, as you perhaps noticed, posting a message 'subscribes' you (puts you on the nosy list). One can also add oneself as nosy with the little button under it without saying anything.

This should be reopened because we do not change error classes in bugfix releases (ie, future 2.7.x releases) because that can break code -- unless the error class is contrary to the doc and we decide the doc is right. Even as a new feature, a change is dubious and carefully to be considered.