Result is [typeless data] in luajit environment

[jonas0616]

-- test.lua
local fleece = require "fleece"
local tbl    = {1,2,3}
local result = fleece.json(tbl)

print(result)

It works just fine by /usr/bin/lua :

$ lua test.lua
$ [1,2,3]

However, it shows [typeless data] when it comes to luajit:

$ luajit test.lua
$ [typeless data]

The version of lua and luajit is:

$ luajit -v
$ LuaJIT 2.0.2 -- Copyright (C) 2005-2013 Mike Pall. http://luajit.org/
$
$ lua -v
$ Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio

Does anyone know how to solve this issue?