'lua_rawlen' returns 'lua_Unsigned' instead of 'size_t'. (Real

length of strings and userdata are limited by Lua integers,
but table length is hard to compute limiting it to 'size_t'.)

lapi.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 2.265 2017/04/24 16:59:26 roberto Exp roberto $
+** $Id: lapi.c,v 2.266 2017/05/11 18:57:46 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -389,7 +389,7 @@ LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
 }
 
 
-LUA_API size_t lua_rawlen (lua_State *L, int idx) {
+LUA_API lua_Unsigned lua_rawlen (lua_State *L, int idx) {
   StkId o = index2addr(L, idx);
   switch (ttype(o)) {
     case LUA_TSHRSTR: return tsvalue(o)->shrlen;

lua.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.332 2016/12/22 15:51:20 roberto Exp roberto $
+** $Id: lua.h,v 1.333 2017/02/23 21:07:34 roberto Exp roberto $
 ** Lua - A Scripting Language
 ** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
 ** See Copyright Notice at the end of this file
@@ -182,7 +182,7 @@ LUA_API lua_Number      (lua_tonumberx) (lua_State *L, int idx, int *isnum);
 LUA_API lua_Integer     (lua_tointegerx) (lua_State *L, int idx, int *isnum);
 LUA_API int             (lua_toboolean) (lua_State *L, int idx);
 LUA_API const char     *(lua_tolstring) (lua_State *L, int idx, size_t *len);
-LUA_API size_t          (lua_rawlen) (lua_State *L, int idx);
+LUA_API lua_Unsigned    (lua_rawlen) (lua_State *L, int idx);
 LUA_API lua_CFunction   (lua_tocfunction) (lua_State *L, int idx);
 LUA_API void	       *(lua_touserdata) (lua_State *L, int idx);
 LUA_API lua_State      *(lua_tothread) (lua_State *L, int idx);