// returns number of changes
static int cSmartSet_withConverter(Concept c, ValueConverterForField converter, O... values) ctex {
  if (c == null) ret 0;
  warnIfOddCount(values = expandParams(c.getClass(), values));
  int changes = 0;
  for (int i = 0; i+1 < l(values); i += 2)
    if (cSmartSetField_withConverter(c, (S) values[i], values[i+1], converter)) ++changes;
  ret changes;
}