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On Sat, 6 Mar 2010, Oliver Schmidt wrote:

> it's not only the data (that can be put before or within the 
> lua_State), there might be also some action within 
> luai_userstateopen, luai_userstatethread, ... How would you handle 
> this, if these macros are going to be removed in Lua 5.2?

If such an extension mechanisms must be supported, I'd rather have the 
Lua API be extended with a runtime mechanism for registering function 
into a list of callbacks to call at specific well defined events, as 
compared with the existing macro definition mechanism.  This way 
separate extensions won't trample on each other.