has $!multiselect;

sub choose ( Array $orig_list, %opt? ) is export {
    return Term::Choose.new().choose( $orig_list, %opt );
}

sub choose_multi ( Array $orig_list, %opt? ) is export {
    return Term::Choose.new().choose_multi( $orig_list, %opt );
}

method choose () {
    $!multiselect = 0;
     self._my_inner_method( ... );
}

method choose_multi () {
    $!multiselect = 1;
    self._my_inner_method( ... );
}

method _my_inner_method ( ... ) {
    ...
    ...
    if $!multiselect {
        ...
    }
    else {
        ...
    }
}