just that one's not likely to see it in casual use.

If a child scope has a variable with the same name as its parent scope, it would look like

my $x;
sub foo { ... $x ... }

sub bar { ... my $x ... }
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What you said boils down to saying bar is unlikely to call foo, and I don't see how that is true.

I it is unlikely that the same var name is used at two levels in a working program, but that's something else.