I feel like this question has been asked in the past but I could not find it in the search.

So I am running this code snippet from Dave Cross' blog titled, Summarizing a Month of Git Activity with Perl (and a Little Help from AI) and I ran into a new feature of Perl -- subroutines that take named arguments. We had prototypes in the past but people said they were wonky so I avoided them for the most part.

So here I am trying to use this thing and I start getting a weird error:

#!/usr/bin/perl -w
use strict;

# LEARN: weird -- the method has named parameters ... since v5.36

sub commits_for_month ($repo, $since, $until) {
  my $cmd = sprintf(
    q{git -C %s log --since="%s" --until="%s" --pretty=format:"%%s"},
    $repo, $since, $until
  );

  my @commits = `$cmd`;
  chomp @commits;

  return @commits;
}

1;
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I get...,

llegal character in prototype for main::commits_for_month : $repo, $si
+nce, $until at ./gitter.pl line 7.
Global symbol "$repo" requires explicit package name (did you forget t
+o declare "my $repo"?) at ./gitter.pl line 10.
Global symbol "$since" requires explicit package name (did you forget 
+to declare "my $since"?) at ./gitter.pl line 10.
Global symbol "$until" requires explicit package name (did you forget 
+to declare "my $until"?) at ./gitter.pl line 11.
./gitter.pl had compilation errors.
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My Perl version:

This is perl 5, version 40, subversion 1 (v5.40.1) built for x86_64-li
+nux-thread-multi
...
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When I look this up using Google's handy-dandy AI it tells me all about the normal way to get passed-in parameters in a subroutine and then tells me that this new syntax is available in v5.36. So I add,

use v5.36;
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To my code and voila, the code compiles,

 perl -c ./gitter.pl
./gitter.pl syntax OK
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Dave's example didn't specify the version like this in his code. Is there something in my environment I am supposed to set to avoid this from happening?