We are using transfer none for all methods returning a GObject DOM Object. That's not true. Only objects derived by Node are automatically released by the DOM object cache and can be transfer none. All other objects are added to the cache only to avoid creating the same wrapper twice for the same core object, but caller should release the returned reference. See also bug #118788
Created attachment 248841 [details] Patch
Committed r181643: <http://trac.webkit.org/changeset/181643>