INSTALL_SIMPLE_READER_WITH_KEY(Attribute, should_auto_deref, auto_deref);
INSTALL_SIMPLE_READER_WITH_KEY(Attribute, should_coerce, coerce);
INSTALL_SIMPLE_READER(Attribute, documentation);
+ INSTALL_SIMPLE_READER(Attribute, insertion_order);
/* predicates */
INSTALL_SIMPLE_PREDICATE_WITH_KEY(Attribute, has_accessor, accessor);