> Unfortunate, but in the case of optional arguments the problem is
> not with typing but with how they are implemented: an optional
> argument of type [t] is actually a non-optional argument of type [t
> option]. They disappear automagically on application, but this means
> that None's are automatically inserted. So applying a function which has
> optional arguments is completely different from a function without
> them (even if the function call looks the same in your source code).
> 

what about optional arguments which have a default value? i would assume 
these are not implemented using options, so would that change anything 
here?

thanks
henri

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