From dc59444cd120e38d0babaeb3a7ad3d36f63225e6 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 19 Jun 2007 17:23:29 -0300
Subject: [PATCH] strong collision for very small numbers used as table keys

---
 bugs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/bugs b/bugs
index adf118d4..f1af3721 100644
--- a/bugs
+++ b/bugs
@@ -1475,6 +1475,23 @@ ldebug.c:
 ]],
 }
 
+Bug{
+what = [[Very small numbers all collide in the hash function.
+(This creates only performance problems; the behavoir is correct.)]],
+report = [[, on ]],
+since = [[Lua 5.0]],
+example = [[ ]],
+patch = [[
+ltable.c:
+87,88c87,88
+<   n += 1;  /* normalize number (avoid -0) */
+<   lua_assert(sizeof(a) <= sizeof(n));
+---
+>   if (luai_numeq(n, 0))  /* avoid problems with -0 */
+>     return gnode(t, 0);
+]],
+}
+
 Bug{
 what = [[ ]],
 report = [[ , on ]],