package Base;
    
    multimethod new => (This::Class)           => sub {...} 
    multimethod new => (This::Class, Negative) => sub {...}
    multimethod new => (This::Class, '#')      => sub {...}
    
    package Der;
    use base 'Base';
    
    multimethod new => (This::Class)      => sub {...}  
    multimethod new => (This::Class, '$') => sub {...}  
    # etc.