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static Map convertObjectMetaToMap(IMeta o, IF0<Map> createEmptyMap default () -> new LinkedHashMap) {
  if (o == null) null;
  
  // The following shortcut depends on the assumption that a meta field never reverts
  // to null when it was a map
  O meta = o._getMeta();
  if (meta cast Map) ret meta;
  
  // non-shortcut path (create meta)
  temp var mutex = tempMetaMutex(o);
  var actualMutex = mutex!;
  synchronized(actualMutex) {
    meta = o._getMeta();
    if (meta cast Map) ret meta;
    Map map = createEmptyMap!;
    if (meta != null) map.put(previousMeta := meta);
    o._setMeta(map);
    ret map;
  }
}