checking fo string

[Hans van der Meer <H.vanderMeer@...>]

I am aware of the fact that on input number arguments are accepted by  
lua_isstring (and luaL_checkstring, etc.), as is mentioned in the  
documentation. Sometimes however it is necessary to reject a number  
and accept a string only. As an example think of 2 optional arguments:
  calling("optional_string")
  calling(optional_number)
  calling("optional_string", optional_number)
In such a case differentiation between a real string and a number  
eases processing of such an argument list. Although it is possible  
differentiate with lua_isnumber, that has the drawback that other  
erroneous types are not catched here.

The solution is to define a macro:
  #define isrealstring(S,A) (!lua_isnumber(S,A) && lua_isstring(S,A))

My point then is: Given the series of lua_is's and luaL-check's, may I  
be so bold as to suggest addition to the upcoming version of Lua of  
something as lua_isrealstring?

Hans van der Meer