Your point is a good one. It is necessary to hand-roll methods that do anything non-simple, like keeping is_from_west_coast() in the correct state.

Because of that, C:MM can only be used for simple methods. In my case, that means C:MM methods are usually private methods, and public methods are hand-rolled.

I am looking forward to automatic method constructors getting smarter in the future. I could imagine a module that combines something like Params::Validate with C:MM, like so:

use Class::MethodMaker
    optional => [ 
        'zone_file' => [ 
            'no spaces', 
            'alpha only', 
            'uppercase', 
            'error on parameter failure' 
        ] 
    ];
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-Dan