“没有”是Lua的基本类型之一吗？(Is 'none' one of basic types in Lua?)

 Lua中定义的基本类型如下： 
 
/*
** basic types
*/
#define LUA_TNONE       (-1)
#define LUA_TNIL        0
#define LUA_TBOOLEAN        1
#define LUA_TLIGHTUSERDATA  2
#define LUA_TNUMBER     3
#define LUA_TSTRING     4
#define LUA_TTABLE      5
#define LUA_TFUNCTION       6
#define LUA_TUSERDATA       7
#define LUA_TTHREAD     8
#define LUA_NUMTAGS     9
 
 正如Lua Document所说，Lua中只有8基本类型。 但是，有10 。 我知道LUA_TLIGHTUSERDATA和LUA_TUSERDATA可以表示为userdata ，但是LUA_TNONE呢？ 什么是none和nil的差异？ 

The basic types defined in Lua as below :
 
/*
** basic types
*/
#define LUA_TNONE       (-1)
#define LUA_TNIL        0
#define LUA_TBOOLEAN        1
#define LUA_TLIGHTUSERDATA  2
#define LUA_TNUMBER     3
#define LUA_TSTRING     4
#define LUA_TTABLE      5
#define LUA_TFUNCTION       6
#define LUA_TUSERDATA       7
#define LUA_TTHREAD     8
#define LUA_NUMTAGS     9
 
As Lua Document says that there only 8 basic types in Lua. However, there gets 10. I know LUA_TLIGHTUSERDATA and LUA_TUSERDATA could finnally represented as userdata, but what about LUA_TNONE? And what is the differences of none and nil?

原文：https://stackoverflow.com/questions/38562720