public static extern VALUE rb_define_class_id(ID name, VALUE super);
public static extern VALUE rb_define_class__id_under(VALUE outer, ID name, VALUE super);
public static extern VALUE rb_define_module_id_under(VALUE outer, ID id);
public static extern VALUE rb_define_module_id(ID id);
public static void rb_define_method_id(VALUE klass, ID name, RubyMethodArg8 method) => rb_define_method_id(klass, name, method, 8);
public static void rb_define_method_id(VALUE klass, ID name, RubyMethodVarArg method) => rb_define_method_id(klass, name, method, -1);
private static extern void rb_define_method_id(VALUE klass, ID name, Delegate method, int argc);