Add rb_typeddata_is_instance_of

Similar to rb_typeddata_is_kind_of, except for that inherited type
is not an instance.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66019 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 3 deletions

diff --git a/iseq.c b/iseq.c
index 888f7f5061..0b5f7c14e4 100644
--- a/iseq.c
+++ b/iseq.c
@@ -2329,9 +2329,7 @@ iseqw_s_of(VALUE klass, VALUE body)
     else if (rb_obj_is_method(body)) {
         iseq = rb_method_iseq(body);
     }
-    else if (RB_TYPE_P(body, T_DATA) &&
-             RTYPEDDATA_P(body) &&
-             RTYPEDDATA_TYPE(body) == &iseqw_data_type) {
+    else if (rb_typeddata_is_instance_of(body, &iseqw_data_type)) {
         return body;
     }