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@{ $self->{column} }   # Infix notation

$self->{column}->@*    # Postfix notation

@{ $ref }              # ok  Derefs $ref
@$ref                  # ok  Derefs $ref

@{ $self->{column} }   # ok  Derefs $self->{column}
@$self->{column}       # XXX Derefs $self