function reifyValueOpener(ids, documentId) {
  for (const id of ids) {
    openers[id]::forEachValue(frames => {
      if (documentId in frames) {
        frames[0] = frames[documentId];
        delete frames[documentId];
      }
    });
  }
}
Moves values of a pre-rendered page identified by documentId to frameId:0