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> Eg Perl doesn’t have a nil type like Go...

That would be Perl 5. Perl 6 does. From https://docs.perl6.org/type/Nil :

"The value Nil may be used to fill a spot where a value would normally go, and in so doing, explicitly indicate that no value is present."

Right, but Perl 6 is also now a different language in its own right.

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