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  1. or download this
    use v5.36;

...
my $foo = Foo->new;
$foo->check_it(42);
$foo->looks_like_number(42);
  2. or download this
    % perl internal.pl
Hoorah!
Can't locate object method "looks_like_number" via package "Foo" at in
+ternal.pl line 22.