I say to you: "Have you ever looked at the async call in threads?"

async(&;@) is just an alias to:

  threads->new( sub {...} );
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What we are doing here is a thread that can be used externally, I can call things from outside inside this thread. Now a normal thread in Perl is just a sub that is called, and what happens after this we don't know or control.

In a normal Perl thread, after create it, we can't say externally to load some modules or to call functions inside it, and this is the point here!