经过 4 个 RC 版本，Lua 终于迎来了 5.3.0 正式版。新版本主要增加对整数支持，支持位操作，提供一个基本的 UTF-8 库。
下载地址：http://www.lua.org/ftp/lua-5.3.0.tar.gz
其他方面的改进包括：
语言特性
userdata can have any Lua value as uservalue
integer division
more flexible rules for some metamethods
库
ipairs and the table library respect metamethods
strip option in string.dump
table library respects metamethods
new function table.move
new function string.pack
new function string.unpack
new function string.packsize
C API
simpler API for continuation functions in C
lua_gettable and similar functions return type of resulted value
strip option in lua_dump
new function: lua_geti
new function: lua_seti
new function: lua_isyieldable
new function: lua_numbertointeger
new function: lua_rotate
new function: lua_stringtonumber
Lua 标准解释器
can be used as calculator; no need to prefix with '='
arg table available to all code