My way of getting error messages when using the wrong property name is by using only the accessor methods. These are made lvalues, so they can be assigned to. 

use Attribute::Property;

package Dog;
sub new : New;
sub intelligence : Property { /^\d+\z/ }

package main;
my $dog = Dog->new(intelligence => 15);
$dog->intelligence++;

my $dog = Dog->new(inteligence => 15);  # error
$dog->inteligence++;                    # error

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It saves a lot of typing (pun intended) too.

Juerd # { site => 'juerd.nl', plp_site => 'plp.juerd.nl', do_not_use => 'spamtrap' }

In reply to Re: use fields; # damnit by Juerd
in thread use fields; # damnit by nothingmuch

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