Ilya Zakharevich on Sat, 27 Jul 2002 10:23:48 -0400

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It looks like polcoeff() is silently converting a rational function
into a power series.  Is it a good thing to do?  I was very surprized
by this (my - wrong - algo did not produce any error, while silently
giving a wrong result).

The fact that it *can* operates on power series *is* mentioned in the
docs, but not in the docs for the function.  The fact that it would
coerce a "wrong" type is not mentioned at all...