merges r24361 from trunk into ruby_1_9_1.

--
* numeric.c (flo_hash): normalize -0.0 to 0.0.  [ruby-core:24577]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@24458 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/numeric.c b/numeric.c
index a3cb3be1c..261c98ad1 100644
--- a/numeric.c
+++ b/numeric.c
@@ -897,6 +897,8 @@ flo_hash(VALUE num)
     int hash;
 
     d = RFLOAT_VALUE(num);
+    /* normalize -0.0 to 0.0 */
+    if (d == 0.0) d = 0.0;
     hash = rb_memhash(&d, sizeof(d));
     return INT2FIX(hash);
 }