docs: def contains_raw(self, etag):
          """When passed a quoted tag it will check if this tag is part of the
          set.  If the tag is weak it is checked against weak and strong tags,
          otherwise strong only."""
          etag, weak = unquote_etag(etag)
          if weak:
              return self.contains_weak(etag)
          return self.contains(etag)