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has 'foo' => ( 
    is       => 'bare', # no accessors
    init_arg => undef, # no longer accessible via constructor
);

# One reasonable constructor interface for a square:
Square->new( center => [ $x, $y ], width => $w );

package Square;
use Moose;
...
    my $width  = $params->{width};
    $self->_construct_coordinates_from_center_and_width( $center, $wid
+th );
}