possible bug of design

[Antero Vipunen <antero@...>]

Salve!

  I though that the following function:

function isItSane(n)
  return (tonumber(tostring(n)) == n);
end

will return _always_ and _everywhere_ return true. But it doesn't! 
Because tostring depends on current locale and tonumber doesn't! It is 
unstable, don't you think?

AMDG,
  Antero Vipunen.