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;
}

Began life as a copy of #1004782