https://git.ruby-lang.org/ruby.git/commit/?id=ccabf4966f

From ccabf4966f4c5a7e19fec52b690d07bf471fc5d1 Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Tue, 12 Jan 2021 16:54:36 +0900
Subject: [ruby/bigdecimal] Fix length calculation in
 rb_uint64_convert_to_BigDecimal

https://github.com/ruby/bigdecimal/commit/14e53ed7f6

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 298e736..4e124bd 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2697,8 +2697,7 @@ rb_uint64_convert_to_BigDecimal(uint64_t uval, RB_UNUSED_VAR(size_t digs), int r https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L2697
         vp->frac[0] = (DECDIG)uval;
     }
     else {
-        const size_t len10 = ceil(LOG10_2 * bit_length(uval));
-        size_t len = roomof(len10, BASE_FIG);
+        const size_t len = (size_t)ceil(log10(uval) / BASE_FIG);
 
         vp = VpAllocReal(len);
         vp->MaxPrec = len;
-- 
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