From 46a1b268eb0534182eda0447303c344a071632fe Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sun, 8 Dec 2019 19:40:24 +0100
Subject: [PATCH] Add stricter check for print() vs. tostring() shortcut.

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

diff --git a/src/lib_base.c b/src/lib_base.c
index 162bbbb2..98ed3d60 100644
--- a/src/lib_base.c
+++ b/src/lib_base.c
@@ -504,7 +504,8 @@ LJLIB_CF(print)
     lua_gettable(L, LUA_GLOBALSINDEX);
     tv = L->top-1;
   }
-  shortcut = (tvisfunc(tv) && funcV(tv)->c.ffid == FF_tostring);
+  shortcut = (tvisfunc(tv) && funcV(tv)->c.ffid == FF_tostring)
+              && !gcrefu(basemt_it(G(L), LJ_TNUMX));
   for (i = 0; i < nargs; i++) {
     const char *str;
     size_t size;