I'm trying my hardest to make sure @cdzombak can't read this code.

gistfile1.m

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if (object == self && context == self.kvoContext) {
        ((void (^)(void)) @{
            @"addresses": ^{ self.peep.address = [self dictionaryForArrayOfValues:self.addresses]; },
            @"emails": ^{ self.peep.email = [self dictionaryForArrayOfValues:self.emails]; },
        }[keyPath] ?: ^{})();
    }
    else if (object == self.peep && context == self.kvoContext) {
        ((void (^)(void)) @{
            @"address": ^{
                _addresses = [self arrayForDictionaryOfValues:self.peep.address
                                                withBackupKey:NSLocalizedString(@"address", nil)];
            },
            @"email": ^{
                _emails = [self arrayForDictionaryOfValues:self.peep.email
                                                withBackupKey:NSLocalizedString(@"email", nil)];
            },
        }[keyPath] ?: ^{})();
    }
    else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}