Actually ARGV::readonly isn't needed with -i.orig (or -pi.orig) because perl does a stat first 

$ perl -pe 1  "echo shabba|"
shabba

$ perl -Tpe 1  "echo shabba|"
Insecure $ENV{PATH} while running with -T switch.

$ perl -Tpi.orig -e 1  "echo shabba|"
Can't open echo shabba|: Invalid argument.

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Happens around http://perl5.git.perl.org/perl.git/blob?f=doio.c#l897

In reply to Re^4: perl -pi -e s'/^\s+//'g $file by Anonymous Monk
in thread perl -pi -e s'/^\s+//'g $file by david_lyon

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