[FWP] JAPH made up entirely of double-chars?

[Sean McAfee <mcafee@transmeta.com>]

Recently I began toying with the idea of writing a JAPH composed entirely
of double-characters; that is, a program for which the i-th character
is the same as the (i+1)-th character, for all even i.  I worked on it
for less than an hour before concluding that such a program is probably
impossible, mainly because no Perl built-in is made of double-characters,
nor is any operator (except qq).  But I figured I would turn the challenge
over to the FWP crowd and see if anyone can surprise me.

An additional hindrance is that the $= variable seems to implicitly
convert to a number any scalar assigned to it.  Observe:

perl -le '$= = "testing"; print $=; $= = \5; print $='

On my machine this prints:

0
135059684

Is this behavior documented anywhere?


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