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sclass ConceptShadow {
  Map map;

  *(Concept c) {
    map = conceptShadow_rawMap(c);
    map = toSortedArrayBasedMap(mapValues convertValue(map));
  }
  
  // legacy
  selfType convertRefsToIDs() { this; }
  
  O convertValue(O o) {
    if (o cast Concept.Ref)
      ret conceptIDObject(o!);
    if (o cast Concept.RefL)
      ret lmap conceptIDObject(o);
    if (o cast Concept)
      ret ConceptID(o);
    ret o;
  }
  
  toString { ret "ConceptShadow " + stringIf(refsConvertedToIDs, "[converted] ") + map; }
  
  O get(O key) { ret mapGet(map, key); }
  
  public bool equals(O o) {
    if (o cast ConceptShadow)
      ret eq(map, o.map);
    false;
  }
  
  long id() { ret toLong(get("id")); }
}