https://git.ruby-lang.org/ruby.git/commit/?id=5c49bb5486

From 5c49bb5486587794ab64dca65f535bf0f4c7c249 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 5 Sep 2020 17:28:06 +0900
Subject: Removed useless casts


diff --git a/marshal.c b/marshal.c
index 2c6ed7a..10114dd 100644
--- a/marshal.c
+++ b/marshal.c
@@ -1503,13 +1503,12 @@ r_string(struct load_arg *arg) https://github.com/ruby/ruby/blob/trunk/marshal.c#L1503
 static VALUE
 r_entry0(VALUE v, st_index_t num, struct load_arg *arg)
 {
-    st_data_t real_obj = (VALUE)Qundef;
-    if (arg->compat_tbl && st_lookup(arg->compat_tbl, v, &real_obj)) {
-        st_insert(arg->data, num, (st_data_t)real_obj);
-    }
-    else {
-        st_insert(arg->data, num, (st_data_t)v);
+    st_data_t real_obj = (st_data_t)v;
+    if (arg->compat_tbl) {
+        /* real_obj is kept if not found */
+        st_lookup(arg->compat_tbl, v, &real_obj);
     }
+    st_insert(arg->data, num, real_obj);
     return v;
 }
 
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