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I've got a library that returns a callable object:

  foo = import("some", "configuration", "parameters", "here")
  foo("user", "args", "here")

There are no C resources associated with 'foo' that need to be
allocated/released, and the only thing a user can do with this object
is call it, so I can just as easily implement 'foo' as a C closure or
as userdata with a __call metamethod. Is there a reason to prefer one
approach over the other?

Currently I'm using a closure because it seems simpler. The sample
code I looked at for doing it with metatables seemed a lot more