Deleting document revisions doesn't delete the equivalent attachment revisions

For example:

• create a document
• upload 5 times the same attachment, creating versions from 1.1 to 1.5 for the attachments (and 2.1 to 6.1 for the document, respectively)
• delete the last 3 document revisions from the history, leaving document version 3.1 in place as the most recent version
• the document version is now 3.1
• the attachment version is 1.2
• the attachment history has all the 5 versions
• uploading the attachment again will cause the attachment and its history to be out of sync (attachment=1.3, history=1.6)