diff --git a/lauxlib.c b/lauxlib.c
index 6a6dd253..035cb06c 100644
--- a/lauxlib.c
+++ b/lauxlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.254 2013/06/25 14:05:26 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.255 2013/06/27 18:32:33 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -150,33 +150,33 @@ LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,
 ** =======================================================
 */
 
-LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
+LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
   lua_Debug ar;
   if (!lua_getstack(L, 0, &ar))  /* no stack frame? */
-    return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
+    return luaL_error(L, "bad argument #%d (%s)", arg, extramsg);
   lua_getinfo(L, "n", &ar);
   if (strcmp(ar.namewhat, "method") == 0) {
-    narg--;  /* do not count `self' */
-    if (narg == 0)  /* error is in the self argument itself? */
+    arg--;  /* do not count `self' */
+    if (arg == 0)  /* error is in the self argument itself? */
       return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
                            ar.name, extramsg);
   }
   if (ar.name == NULL)
     ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";
   return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
-                        narg, ar.name, extramsg);
+                        arg, ar.name, extramsg);
 }
 
 
-static int typeerror (lua_State *L, int narg, const char *tname) {
+static int typeerror (lua_State *L, int arg, const char *tname) {
   const char *msg = lua_pushfstring(L, "%s expected, got %s",
-                                    tname, luaL_typename(L, narg));
-  return luaL_argerror(L, narg, msg);
+                                    tname, luaL_typename(L, arg));
+  return luaL_argerror(L, arg, msg);
 }
 
 
-static void tag_error (lua_State *L, int narg, int tag) {
-  typeerror(L, narg, lua_typename(L, tag));
+static void tag_error (lua_State *L, int arg, int tag) {
+  typeerror(L, arg, lua_typename(L, tag));
 }
 
 
@@ -317,15 +317,15 @@ LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
 ** =======================================================
 */
 
-LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
+LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def,
                                  const char *const lst[]) {
-  const char *name = (def) ? luaL_optstring(L, narg, def) :
-                             luaL_checkstring(L, narg);
+  const char *name = (def) ? luaL_optstring(L, arg, def) :
+                             luaL_checkstring(L, arg);
   int i;
   for (i=0; lst[i]; i++)
     if (strcmp(lst[i], name) == 0)
       return i;
-  return luaL_argerror(L, narg,
+  return luaL_argerror(L, arg,
                        lua_pushfstring(L, "invalid option " LUA_QS, name));
 }
 
@@ -342,86 +342,86 @@ LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
 }
 
 
-LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
-  if (lua_type(L, narg) != t)
-    tag_error(L, narg, t);
+LUALIB_API void luaL_checktype (lua_State *L, int arg, int t) {
+  if (lua_type(L, arg) != t)
+    tag_error(L, arg, t);
 }
 
 
-LUALIB_API void luaL_checkany (lua_State *L, int narg) {
-  if (lua_type(L, narg) == LUA_TNONE)
-    luaL_argerror(L, narg, "value expected");
+LUALIB_API void luaL_checkany (lua_State *L, int arg) {
+  if (lua_type(L, arg) == LUA_TNONE)
+    luaL_argerror(L, arg, "value expected");
 }
 
 
-LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
-  const char *s = lua_tolstring(L, narg, len);
-  if (!s) tag_error(L, narg, LUA_TSTRING);
+LUALIB_API const char *luaL_checklstring (lua_State *L, int arg, size_t *len) {
+  const char *s = lua_tolstring(L, arg, len);
+  if (!s) tag_error(L, arg, LUA_TSTRING);
   return s;
 }
 
 
-LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
+LUALIB_API const char *luaL_optlstring (lua_State *L, int arg,
                                         const char *def, size_t *len) {
-  if (lua_isnoneornil(L, narg)) {
+  if (lua_isnoneornil(L, arg)) {
     if (len)
       *len = (def ? strlen(def) : 0);
     return def;
   }
-  else return luaL_checklstring(L, narg, len);
+  else return luaL_checklstring(L, arg, len);
 }
 
 
-LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
+LUALIB_API lua_Number luaL_checknumber (lua_State *L, int arg) {
   int isnum;
-  lua_Number d = lua_tonumberx(L, narg, &isnum);
+  lua_Number d = lua_tonumberx(L, arg, &isnum);
   if (!isnum)
-    tag_error(L, narg, LUA_TNUMBER);
+    tag_error(L, arg, LUA_TNUMBER);
   return d;
 }
 
 
-LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
-  return luaL_opt(L, luaL_checknumber, narg, def);
+LUALIB_API lua_Number luaL_optnumber (lua_State *L, int arg, lua_Number def) {
+  return luaL_opt(L, luaL_checknumber, arg, def);
 }
 
 
-static void interror (lua_State *L, int narg) {
-  if (lua_type(L, narg) == LUA_TNUMBER)
-    luaL_argerror(L, narg, "float value out of range");
+static void interror (lua_State *L, int arg) {
+  if (lua_type(L, arg) == LUA_TNUMBER)
+    luaL_argerror(L, arg, "float value out of range");
   else
-    tag_error(L, narg, LUA_TNUMBER);
+    tag_error(L, arg, LUA_TNUMBER);
 }
 
 
-LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
+LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int arg) {
   int isnum;
-  lua_Integer d = lua_tointegerx(L, narg, &isnum);
+  lua_Integer d = lua_tointegerx(L, arg, &isnum);
   if (!isnum) {
-    interror(L, narg);
+    interror(L, arg);
   }
   return d;
 }
 
 
-LUALIB_API lua_Unsigned luaL_checkunsigned (lua_State *L, int narg) {
+LUALIB_API lua_Unsigned luaL_checkunsigned (lua_State *L, int arg) {
   int isnum;
-  lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);
+  lua_Unsigned d = lua_tounsignedx(L, arg, &isnum);
   if (!isnum)
-    interror(L, narg);
+    interror(L, arg);
   return d;
 }
 
 
-LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
+LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int arg,
                                                       lua_Integer def) {
-  return luaL_opt(L, luaL_checkinteger, narg, def);
+  return luaL_opt(L, luaL_checkinteger, arg, def);
 }
 
 
-LUALIB_API lua_Unsigned luaL_optunsigned (lua_State *L, int narg,
+LUALIB_API lua_Unsigned luaL_optunsigned (lua_State *L, int arg,
                                                         lua_Unsigned def) {
-  return luaL_opt(L, luaL_checkunsigned, narg, def);
+  return luaL_opt(L, luaL_checkunsigned, arg, def);
 }
 
 /* }====================================================== */
diff --git a/lauxlib.h b/lauxlib.h
index 24a6dbaf..9141aad5 100644
--- a/lauxlib.h
+++ b/lauxlib.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.h,v 1.121 2013/06/25 14:05:26 roberto Exp roberto $
+** $Id: lauxlib.h,v 1.122 2013/06/27 18:32:33 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -35,24 +35,24 @@ LUALIB_API void (luaL_checkversion_) (lua_State *L, int ver, size_t sz);
 LUALIB_API int (luaL_getmetafield) (lua_State *L, int obj, const char *e);
 LUALIB_API int (luaL_callmeta) (lua_State *L, int obj, const char *e);
 LUALIB_API const char *(luaL_tolstring) (lua_State *L, int idx, size_t *len);
-LUALIB_API int (luaL_argerror) (lua_State *L, int numarg, const char *extramsg);
-LUALIB_API const char *(luaL_checklstring) (lua_State *L, int numArg,
+LUALIB_API int (luaL_argerror) (lua_State *L, int arg, const char *extramsg);
+LUALIB_API const char *(luaL_checklstring) (lua_State *L, int arg,
                                                           size_t *l);
-LUALIB_API const char *(luaL_optlstring) (lua_State *L, int numArg,
+LUALIB_API const char *(luaL_optlstring) (lua_State *L, int arg,
                                           const char *def, size_t *l);
-LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int numArg);
-LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int nArg, lua_Number def);
+LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int arg);
+LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int arg, lua_Number def);
 
-LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int numArg);
-LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int nArg,
+LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int arg);
+LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int arg,
                                           lua_Integer def);
-LUALIB_API lua_Unsigned (luaL_checkunsigned) (lua_State *L, int numArg);
-LUALIB_API lua_Unsigned (luaL_optunsigned) (lua_State *L, int numArg,
+LUALIB_API lua_Unsigned (luaL_checkunsigned) (lua_State *L, int arg);
+LUALIB_API lua_Unsigned (luaL_optunsigned) (lua_State *L, int arg,
                                             lua_Unsigned def);
 
 LUALIB_API void (luaL_checkstack) (lua_State *L, int sz, const char *msg);
-LUALIB_API void (luaL_checktype) (lua_State *L, int narg, int t);
-LUALIB_API void (luaL_checkany) (lua_State *L, int narg);
+LUALIB_API void (luaL_checktype) (lua_State *L, int arg, int t);
+LUALIB_API void (luaL_checkany) (lua_State *L, int arg);
 
 LUALIB_API int   (luaL_newmetatable) (lua_State *L, const char *tname);
 LUALIB_API void  (luaL_setmetatable) (lua_State *L, const char *tname);
@@ -62,7 +62,7 @@ LUALIB_API void *(luaL_checkudata) (lua_State *L, int ud, const char *tname);
 LUALIB_API void (luaL_where) (lua_State *L, int lvl);
 LUALIB_API int (luaL_error) (lua_State *L, const char *fmt, ...);
 
-LUALIB_API int (luaL_checkoption) (lua_State *L, int narg, const char *def,
+LUALIB_API int (luaL_checkoption) (lua_State *L, int arg, const char *def,
                                    const char *const lst[]);
 
 LUALIB_API int (luaL_fileresult) (lua_State *L, int stat, const char *fname);
@@ -114,8 +114,8 @@ LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
 #define luaL_newlib(L,l)  \
   (luaL_checkversion(L), luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))
 
-#define luaL_argcheck(L, cond,numarg,extramsg)	\
-		((void)((cond) || luaL_argerror(L, (numarg), (extramsg))))
+#define luaL_argcheck(L, cond,arg,extramsg)	\
+		((void)((cond) || luaL_argerror(L, (arg), (extramsg))))
 #define luaL_checkstring(L,n)	(luaL_checklstring(L, (n), NULL))
 #define luaL_optstring(L,n,d)	(luaL_optlstring(L, (n), (d), NULL))
 #define luaL_checkint(L,n)	((int)luaL_checkinteger(L, (n)))