**In `FastAPI`**

This allows setting the (mostly new) parameters (additionally to the already existing parameters):

* `default_response_class`: updated to handle defaults in `APIRouter` and `include_router`.

// the subslices between those separators.
// If sep is empty, SplitN splits after each UTF-8 sequence.
// The count determines the number of subslices to return:
//   - n > 0: at most n subslices; the last subslice will be the unsplit remainder;
//   - n == 0: the result is nil (zero subslices);
//   - n < 0: all subslices.
//
// To split around the first instance of a separator, see [Cut].

      }
    }
  }

  /** Returns the {@code Class} object of arrays with {@code componentType}. */
  static Class<?> getArrayClass(Class<?> componentType) {
    // TODO(user): This is not the most efficient way to handle generic
    // arrays, but is there another way to extract the array class in a
    // non-hacky way (i.e. using String value class names- "[L...")?
    return Array.newInstance(componentType, 0).getClass();