// returns true if change
// DUPLICATED in convertToField AND DefaultValueConverterForField...
sbool _cSmartSetField(Concept c, S field, O value) ctex {
  Field f = setOpt_findField(c.getClass(), field);
  if (f != null && value != null) {
    Class actualType = f.getType();
    Class type = primitiveToBoxedTypeOpt(actualType);
    
    // int magic
    
    if (type == Int.class && !value instanceof Int) {
      if (!setField_trueIfChanged(f, c, toInt(trimIfString(value)))) false;
      if (!isTransient(f)) c.change();
      true;
    }
    
    // bool magic
    
    if (type == Bool.class && value instanceof S)
      if (actualType == Bool.class && eq(value, ""))
        ret _csetField(c, field, null);
      else
        ret _csetField(c, field, eqicOneOf((S) value, "1", "true", "yes"));

    // GlobalID magic
    
    ifclass GlobalID
    if (type == GlobalID.class && value instanceof S)
      ret _csetField(c, field, GlobalID((S) value));
    endif
  }
  ret _csetField(c, field, value);
}