In perlrun, it mentions:
If the #! line does not contain the word "perl" nor the word "indir", the program named after the #! is executed instead of the Perl interpreter.
I found with git that "indir" support was added in a cleanup commit for Perl 5.0 in 1994 and was mentioned in perlrun in 2012. Just out of curiousity, what is "indir" referring to?

In reply to "indir" in shebang line by ForgotPasswordAgain

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