You can't really use an eskimo kiss with -p. And it's equivalent to an END block so I'm not sure how that would help here.
But the open STDOUT, qq(>$ARGV.ext); version does work when slurping the files with -p00, for example in the case of a global substitution.
In reply to Re^4: One to one file output idiom
by Eily
in thread One to one file output idiom
by Eily
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