https://git.ruby-lang.org/ruby.git/commit/?id=887a1bfbbc

From 887a1bfbbc336cf4292d5489e7a7a234ad93478e Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Sat, 9 Jan 2021 17:31:23 +0900
Subject: [ruby/bigdecimal] Stop using GetVpValue in
 rb_big_convert_to_BigDecimal

https://github.com/ruby/bigdecimal/commit/034fd2b25e

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index bcc2b32..5821a0a 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2791,7 +2791,10 @@ rb_big_convert_to_BigDecimal(VALUE val, RB_UNUSED_VAR(size_t digs), int raise_ex https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L2791
     }
 #endif
     else {
-        Real *vp = GetVpValue(val, 1);
+        VALUE str = rb_big2str(val, 10);
+        Real *vp = VpCreateRbObject(RSTRING_LEN(str) + BASE_FIG + 1,
+                                    RSTRING_PTR(str), true);
+        RB_GC_GUARD(str);
         return check_exception(vp->obj);
     }
 }
-- 
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