I'm not completely sure about the following (well, to be honest, I am, but I
think I shouldn't be).  In any case, I think we should take a decision.  I see
two possibilities:

A) InputForm should be precise.  I.e., a given InputForm completely determines
   which functions are called, independent on what is exposed etc.

B) InputForm should be vague.  I.e., calling "interpret" on a given InputForm
   mimicks behaviour at the prompt.

Currently, at least seriesSolve$EXPRODE depends on behaviour B: the InputForm
corresponding to an element of EXPR INT is *not* decorated with package calls,
and can easily be re-interpreted as function from UTS -> UTS.

I think that this is not a very robust and clean solution, as demonstrated also
by #301.  I see two possibilities:

a) provide a function that takes an InputForm, and converts calls to EXPR INT
   to calls to UTS or whatever needed.

b) take a completely different approach.

Ideas?

Martin


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