hash.c: same hash values with Float#hash

* hash.c (rb_any_hash): use same hash values with Float#hash so
  that -0.0 and +0.0 will be identical.
  [ruby-core:68541] [Bug #10979]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49999 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 6ab27e8a77..463c7c8e94 100644
--- a/hash.c
+++ b/hash.c
@@ -142,13 +142,16 @@ rb_any_hash(VALUE a)
 	}
 	else if (FLONUM_P(a)) {
 	    /* prevent pathological behavior: [Bug #10761] */
-	    a = (st_index_t)rb_float_value(a);
+	    return rb_dbl_hash(rb_float_value(a));
 	}
 	hnum = rb_objid_hash((st_index_t)a);
     }
     else if (BUILTIN_TYPE(a) == T_STRING) {
 	hnum = rb_str_hash(a);
     }
+    else if (BUILTIN_TYPE(a) == T_FLOAT) {
+	return rb_dbl_hash(rb_float_value(a));
+    }
     else {
         hval = rb_hash(a);
 	hnum = FIX2LONG(hval);