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    return '_rpcs can be used';
}

sub substract {
    my ( $self, $res, @params ) = @_;
    $res = 0 if !defined $res;
    $res -= $_ for @params;
    return $res;
}

sub update {
    my ( $self, @params ) = @_;

    # notification only

    return;
}

sub foobar {
    my ($self) = @_;