You've just broken polymorphism with your use of ref() and UNIVERSAL::isa(). The correct incantation follows.

defined( blessed( $_[0] ) ) and $_[0]->isa( __PACKAGE__ )

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In reply to Re^2: enabling OO and non-OO access to the same module using a hash reference by diotalevi
in thread enabling OO and non-OO access to the same module using a hash reference by Moron

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