https://git.ruby-lang.org/ruby.git/commit/?id=3a97d36157

From 3a97d361576d1cc198047d502c5165aa37b7f86e Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 21 Oct 2020 23:57:44 +0900
Subject: refactoring frozen_shareable_p


diff --git a/ractor.c b/ractor.c
index 93a1fc5..2cf34cb 100644
--- a/ractor.c
+++ b/ractor.c
@@ -2065,18 +2065,14 @@ rb_obj_traverse(VALUE obj, https://github.com/ruby/ruby/blob/trunk/ractor.c#L2065
 static int
 frozen_shareable_p(VALUE obj)
 {
-    switch (BUILTIN_TYPE(obj)) {
-      case T_DATA:
-        if (RTYPEDDATA_P(obj)) {
-            const rb_data_type_t *type = RTYPEDDATA_TYPE(obj);
-            if (type->flags & RUBY_TYPED_FROZEN_SHAREABLE) {
-                return true;
-            }
-        }
-        return false;
-      default:
+    if (!RB_TYPE_P(obj, T_DATA) ||
+        (RTYPEDDATA_P(obj) &&
+         RTYPEDDATA_TYPE(obj)->flags & RUBY_TYPED_FROZEN_SHAREABLE)) {
         return true;
     }
+    else {
+        return false;
+    }
 }
 
 static int
-- 
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