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% stephan@ape (/home/stephan) %
% cat io_from_scalar.px
...
  open my $fh2, "<:unix", \$io or die;
  print "ok, fh from memory -- unix layer";
}

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% # result
% stephan@ape (/home/stephan) %
...
>> ok, fh from memory -- default layer
. trying IO from memory -- (explicit) unix layer
Died at io_from_scalar.px line 14.