But, what if the programmers use Perl (and are into the Community), but the person who typed the "job request" (*) thought that when the boss said 'Perl' he meant 'PERL' (or even Pearl, who knows :-) and "corrects" the text before publishing ? (or maybe qr/s?he/ typed in CAPS to "highlight" (*) the word)

Now, if the employer always uses PERL consistently (*), then I think it's ok to use it as a "shibboleth" (**)

(*) Disclaimer: English isn't my first language - I don't know the right qr/words?/i ^_^;;;

(**) Coincidence: I saw that word on WikiPedia yesterday :-)