https://git.ruby-lang.org/ruby.git/commit/?id=b4ade73974

From b4ade73974f7023bff9059737a8ff73fe1c09f40 Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Thu, 14 Jan 2021 09:23:26 +0900
Subject: [ruby/bigdecimal] Explicitly cast uint64_t to double

https://github.com/ruby/bigdecimal/commit/f0d94e6843

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index f48f3ed..e560c19 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2704,7 +2704,7 @@ 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#L2704
         vp->frac[0] = (DECDIG)uval;
     }
     else {
-        const size_t len = (size_t)ceil(log10(uval) / BASE_FIG);
+        const size_t len = (size_t)ceil(log10((double)uval) / BASE_FIG);
 
         vp = VpAllocReal(len);
         vp->MaxPrec = len;
-- 
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