code: function hardLock(callback) {
        return self.apos.locks.lock('save-area-' + docId, { waitForSelf: true }, function(err) {
          if (err) {
            return callback(err);
          }
          hardLocked = true;
          return callback(null);
        });
      }
docs: Also grab a hard lock on this document, just for the duration of the actual "load, sanitize stuff, and update" operation, to avoid a race condition if saving two areas around the same time, as can happen during drag and drop between areas