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    if (defined $self->pathname) {
        $self->io_handle(IO::File->new);
...
        # XXX Not tested
        $self->io_handle->fdopen($self->_handle, @args);
    }

    ...
    elsif (defined $self->_handle) {
...
            $self->io_handle->fdopen($self->_handle, @args);
        }
    }