From f44acf7bf87c8f4ad258a41bb7884c1f09a8aab9 Mon Sep 17 00:00:00 2001
From: Yukihiro Matsumoto <matz@ruby-lang.org>
Date: Wed, 23 May 2012 02:18:40 +0900
Subject: explicit normalization -0.0 to 0.0

---
 src/numeric.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/numeric.c b/src/numeric.c
index cddd7af27..a959718dd 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -372,7 +372,8 @@ flo_hash(mrb_state *mrb, mrb_value num)
   int i, hash;
 
   d = (mrb_float)mrb_fixnum(num);
-  if (d == 0) d = fabs(d);
+  /* normalize -0.0 to 0.0 */
+  if (d == 0) d = 0.0;
   c = (char*)&d;
   for (hash=0, i=0; i<sizeof(mrb_float);i++) {
     hash = (hash * 971) ^ (unsigned char)c[i];
-- 
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