DELETE on objects doesn't work correctly

A DELETE request on an object doesn't delete it.

Steps to reproduce:

1) Create an object on Main.WebHome (let's say an XWiki.TagClass object whose object number is 3)
2) curl http://localhost:8080/xwiki/rest/wikis/xwiki/spaces/Main/pages/WebHome/objects/TagClass/3
3) curl -u "Admin:admin" -X "DELETE" http://localhost:8080/xwiki/rest/wikis/xwiki/spaces/Main/pages/WebHome/objects/TagClass/3
4) curl http://localhost:8080/xwiki/rest/wikis/xwiki/spaces/Main/pages/WebHome/objects/TagClass/3

The object is still there.