Option 0 for step multiplier makes GC non-incremental

llimits.h

@@ -33,7 +33,8 @@ typedef unsigned long lu_mem;
 typedef long l_obj;
 #endif				/* } */
 
-#define MAX_LOBJ	cast(l_obj, ~cast(lu_mem, 0) >> 1)
+#define MAX_LOBJ  \
+	cast(l_obj, (cast(lu_mem, 1) << (sizeof(l_obj) * CHAR_BIT - 1)) - 1)
 
 
 /* chars used as small naturals (so that 'char' is reserved for characters) */
@@ -44,7 +45,10 @@ typedef signed char ls_byte;
 /* maximum value for size_t */
 #define MAX_SIZET	((size_t)(~(size_t)0))
 
-/* maximum size visible for Lua (must be representable in a lua_Integer) */
+/*
+** Maximum size for strings and userdata visible for Lua (should be
+** representable in a lua_Integer)
+*/
 #define MAX_SIZE	(sizeof(size_t) < sizeof(lua_Integer) ? MAX_SIZET \
                           : (size_t)(LUA_MAXINTEGER))