Put/DeleteObjectTagging set the update directory to the bucket root for a
null version, so a tag change on allowed/protected.txt landed on
protected.txt at the bucket root instead. A principal scoped to one
nested key could overwrite a different object sharing the basename, the
same class of scope bypass fixed for PutObjectAcl. Share the object's
parent-directory resolver across both paths.
Chris Lu
0ad83d5061