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    @{ $self->{column} }   # Infix notation
    
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    $self->{column}->@*    # Postfix notation
    
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    @{ $ref }              # ok  Derefs $ref
    @$ref                  # ok  Derefs $ref
    
    @{ $self->{column} }   # ok  Derefs $self->{column}
    @$self->{column}       # XXX Derefs $self