They should have done what the YAML designers did when they suddenly realized to their great surprise that the language they themselves designed and named was NOT actually a markup language:

Keep the exact same name and a perfectly straight face, then recursively retronymonically redefine it to mean something completely different: the opposite of what it initially meant!

"Yet Another Markup Language" => "YAML Ain't Markup Language"

So "PERL 5" is to "Practical Extraction and Reporting Language 6", as "PERL 6" is a "PERL E___ R___ L___ 6".

(Pattern matching and filling in the blanks is left as an exercise for GTP-3.)