diff --git a/lobject.h b/lobject.h
index bb700fc7..3050e4e4 100644
--- a/lobject.h
+++ b/lobject.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.64 2011/10/31 17:48:22 roberto Exp roberto $
+** $Id: lobject.h,v 2.65 2012/01/20 22:05:50 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -36,6 +36,9 @@
 ** bit 6: whether value is collectable
 */
 
+#define VARBITS		(3 << 4)
+
+
 /*
 ** LUA_TFUNCTION variants:
 ** 0 - Lua function
@@ -121,13 +124,14 @@ typedef struct lua_TValue TValue;
 
 /* Macros to test type */
 #define checktag(o,t)		(rttype(o) == (t))
+#define checktype(o,t)		(ttypenv(o) == (t))
 #define ttisnumber(o)		checktag((o), LUA_TNUMBER)
 #define ttisnil(o)		checktag((o), LUA_TNIL)
 #define ttisboolean(o)		checktag((o), LUA_TBOOLEAN)
 #define ttislightuserdata(o)	checktag((o), LUA_TLIGHTUSERDATA)
 #define ttisstring(o)		checktag((o), ctb(LUA_TSTRING))
 #define ttistable(o)		checktag((o), ctb(LUA_TTABLE))
-#define ttisfunction(o)		(ttypenv(o) == LUA_TFUNCTION)
+#define ttisfunction(o)		checktype(o, LUA_TFUNCTION)
 #define ttisclosure(o)		((rttype(o) & 0x1F) == LUA_TFUNCTION)
 #define ttisCclosure(o)		checktag((o), ctb(LUA_TCCL))
 #define ttisLclosure(o)		checktag((o), ctb(LUA_TLCL))
@@ -350,7 +354,9 @@ typedef struct lua_TValue TValue;
 */
 
 #undef checktag
+#undef checktype
 #define checktag(o,t)	(tt_(o) == tag2tt(t))
+#define checktype(o,t)	(ctb(tt_(o) | VARBITS) == ctb(tag2tt(t) | VARBITS))
 
 #undef ttisequal
 #define ttisequal(o1,o2)  \