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).

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

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

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