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sbool cSmartSetField_withConverter(Concept c, S field, O value, bool verbose default false) {
  ret cSmartSetField_withConverter(c, field, value, new DefaultValueConverterForField, verbose);
}

// returns true if change
sbool cSmartSetField_withConverter(Concept c, S field, O value, ValueConverterForField converter, bool verbose default false) ctex {
  Field f = setOpt_findField(c.getClass(), field);
  
  if (f != null) {
    if (verbose) print("cSmartSetField_withConverter: setting " + f + " = " + value);
    if (converter != null && value != null) {
      OrError<O> result = converter.convertValue(c, f, value);
      if (result == null) fail("Unknown conversion " + className(value) + " => " + f);
      if (!result.ok()) fail("Unknown conversion " + className(value) + " => " + f + ": " + result.error());
      value = result!;
    }
    if (verbose) print("cSmartSetField_withConverter: converted value=" + value);
    
    // convert L to RefL
    if (value instanceof L && f.getType() == Concept.RefL.class) {
      Concept.RefL l = cast f.get(c);
      if (verbose) print("cSmartSetField_withConverter: RefL=" + l);
      l.replaceWithList((L) value);
      if (verbose) print("cSmartSetField_withConverter: backrefs=" + c.backRefs);
      true;
    }
    
    // convert concept to Ref
    
    if (value instanceof Concept && f.getType() == Concept.Ref.class)
      ret ((Concept.Ref) f.get(c)).set((Concept) value);
  }
 
  ret _csetField(c, field, value);
}