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> And, last remark, it seems a good idea to write it in the new manual

  Several functions in the auxiliary library are used to check C function
  arguments. Their names are always luaL_check* or luaL_opt*. All of these
  functions raise an error if the check is not satisfied. Because the
  error message is formatted for arguments (e.g., "bad argument #1"), you
  should not use these functions for other stack values.

-- Roberto