That it is about as fast as you are likely to get; that it is built-in to language so always available; and that it understands Perl internals; does.

I fail to parse that sentence. I also fail to parse the updated version:

That it is about as fast as you are likely to get, it is built-in to language so always available, and it understands Perl internals, do.

What does the final ",do" do?

So, sorting data when you want to sort according the the entire value of each element of the array or list is easy.

I'd rather not use the statement-modifier mode here, instead I'd say (s/the the/the/):

So, sorting data is easy when you want to sort according the entire value of each element of the array or list.

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}