Parameters

my $c = container MyApp => as {
    service user => (
        class => 'User',
        parameters => {
            name => { isa => 'Str' },
        },
    );
    service superusers => (
        block => sub { [ $_[0]->param('root') ] },
        dependencies => {
            root => { user => { name => 'root' } },
        },
    );
};