See now I would write

sub main
{
}

exit main;
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But when you do your main as a sub its different to doing your main as code as it ivolves a lexical scope. But this is good practice, in fact tye somewhere has a node covering a similer but more involved version of the same thing.

Yves / DeMerphq
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When to use Prototypes?
Advanced Sorting - GRT - Guttman Rosler Transform