Parameters

my $c = container MyApp => as {
    service user => (
        class => 'User',
        parameters => {
            name => { isa => 'Str', optional => 1, default => 'guest' },
        },
    );
};
# user with name 'guest'
$c->resolve(service => 'user');
# user with name 'doy'
$c->resolve(service => 'user', parameters => { name => 'doy' });