sO convertPrimitiveIfNecessary(O o, Class b) {
  if (b.isPrimitive()) {
    if (o cast Char)  {
      char x = cast o;
      if (b == int.class) ret Int.valueOf(x);
      if (b == long.class) ret Long.valueOf(x);
      if (b == float.class) ret Float.valueOf(x);
      if (b == double.class) ret Double.valueOf(x);
    } else if (o cast Number) {
      if (b == char.class) ret Char.valueOf((char) o.intValue());
      if (b == short.class) ret o.shortValue();
      if (b == int.class) ret o.intValue();
      if (b == long.class) ret o.longValue();
      if (b == float.class) ret o.floatValue();
    }
  }
  ret o;
}