code: private <T> BindingAmp<T> findObjectBinding(Key<T> key)
    {
      Objects.requireNonNull(key);
  
      if (key.qualifiers().length != 1) {
        throw new IllegalArgumentException();
  
      }
      return (BindingAmp) findBinding(Key.of(Object.class,
                                             key.qualifiers()[0]));
    }
docs: Returns an object producer.