Are you sure you're ready for "object oriented programming"? In all the years I've done OOP (25 years now), I've never wanted to "clean out all the data without deleting the object itself". Maybe if you state what your real problem is, we can reply with a more in-band way of accomplishing this.
I know that if I saw code like your delete, I'd pull one of those Scooby-Do scrunchy-face "HunH?" expressions. So, even if this accomplishes what you want in the short-term, you're destroying your long term maintainability. Perl code already gets a bad slap too often for that—no point in increasing that by going down the path you've started to choose.
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