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#!/usr/bin/env perl -l

...
        }
    }
}

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Examining 'undefined':
    The value of 'undefined' is not a reference.
...
    The value of 'vstring_ref' is 'VSTRING(0x7fdcff02e130)'.
    The ref() value of 'vstring_ref' is 'VSTRING'.
    TODO: Further work on this type is left as an exercise for the rea
+der.