HaloO,
Larry Wall wrote:

That's what I thought. Now note that ! can't easily be rewritten
as a simple binary operator (unless you do something recursive, and
then it's not simple).

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Would $x! == [*]1..$x constitute simple parserwise? Admittedly
it's not a single but two ops and one of them a meta.

Now, I think I know how to make the parser use precedence on either
a prefix or a postfix to get the desired effect (but perhaps not going
both directions simulatenously).

But that leads me to a slightly
different parsing question, which comes from the asymmetry of postfix
operators.

How are postfix operators asymmetric?
Regards, TSa.
--
The Angel of Geometry and the Devil of Algebra fight for the soul
of any mathematical being. -- Attributed to Hermann Weyl