I'm not entirely sure, but based on my experience with OO in Perl i guess that it simply uses an array in a special attribute, instead of putting the various at

I'm not entirely sure, but based on my experience with OO in Perl i guess that it simply uses an array in a special attribute, instead of putting the various attributes into dict keys on the actual object. Possibly it even uses some kind of inside-out implementation where the arrays are stored via closure in some other scope and only visible to accessor methods.