Although I used only "\n" in the script, Perl was clever enough to transform it into a windowish "\r\n" (0D 0A) end of line character combination
I think stevieb was alluding to the files that *ship* with StrawberryPerl.
In my version of StrawberryPerl (5.22.0 portable) the files have nix line endings. (At least the few that I checked in perl/vendor/lib did.)
This can probably vary from one installation to another, depending upon the behaviour of the utility (re line endings) that unpacked the StrawberryPerl distro.