[Pharo-project] FilePlugin changed it's behavior?

Hi guys, I'm looking at this issue: http://code.google.com/p/pharo/issues/detail?can=2&start=0&num=100&q=&colspe... . And debugging, it seems that the primitive rename: oldFileFullName to: newFileFullName "Rename the file of the given name to the new name. Fail if there is no file of the old name or if there is an existing file with the new name." <primitive: 'primitiveFileRename' module: 'FilePlugin'> ^nil is not failing as it says it should in the comment. Has this behavior changed lately? Should this be fixed in the vm side, wait for NativeBoost? Or we should just by now fix the comment and clients not to expect that? some pointer? Tx