From 277be410f31efc1dfa6e2d4bcc56b9c21b300bc6 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 20 Jul 2019 02:57:36 +0900
Subject: No rounding needed if 'ndigits` is bigger than `DBL_DIG+2`; fix #4566

---
 src/numeric.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/numeric.c b/src/numeric.c
index 4288df44a..a1299a74f 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -702,6 +702,7 @@ flo_round(mrb_state *mrb, mrb_value num)
 
   f = 1.0;
   i = ndigits >= 0 ? ndigits : -ndigits;
+  if (ndigits > DBL_DIG+2) return num;
   while  (--i >= 0)
     f = f*10.0;
 
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