Thanks for correction. Maybe you are right. My experiense is not enough for confirmation or refutation your assertion. I use a book 'Object Oriented Perl' by Damian Conway and there are two ways to do a clon of existing object (p. 104). In my mind, for person, who use some class, it's easier to call one method new() for creation or copy of an object intead of calling separate methods for this.

      
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SV* sv_bless(SV* sv, HV* stash);