Re: Macro expansion of lua_newuserdata()?

[Roberto Ierusalimschy <roberto@...>]

> Ah, it ought to have been obvious, thanks!

It is explained in the manual:

  Full userdata now has an arbitrary number of associated user values.
  [...]
  For compatibility, the old names still work as macros assuming one
  single user value.  Note, however, that userdata with zero user values
  are more efficient memory-wise.

-- Roberto