sclass SizeEstimate {
  new Map<S, Long> shallowFieldSizes;
  Collection<S> complexFields;
  new Map<S, Long> complexFieldSizes;
}

static SizeEstimate estimateWebBotSize(O o) {
  new SizeEstimate se;
  O o = agiBlue_server_webBot();
  Collection<S> fields = fields(o);
  fields = filter(fields, field -> {
    O value = get(o, field);
    if (value == null) false;
    Class type = value.getClass();
    if (isBoxedType(type)) false;
    true;
  });
  se.complexFields = fields;
  ret se;
}