static <A> A setAll(A o, Map<S, O> fields) {

  if (fields == null) ret o;

  for (S field : keys(fields))

    set(o, field, fields.get(field));

  ret o;

}

static <A> A setAll(A o, O... values) {

  //values = expandParams(c.getClass(), values);

  failIfOddCount(values);

  for (int i = 0; i+1 < l(values); i += 2) {

    S field = (S) values[i];

    O value = values[i+1];

    set(o, field, value);

  }

  ret o;

}