def list_faces(large_face_list_id, start:nil, top:nil, custom_headers:nil)
      response = list_faces_async(large_face_list_id, start:start, top:top, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
def list_faces(large_face_list_id, start:nil, top:nil, custom_headers:nil)
      response = list_faces_async(large_face_list_id, start:start, top:top, custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
List all faces in a large face list, and retrieve face information (including
 userData and persistedFaceIds of registered faces of the face).

 @param large_face_list_id [String] Id referencing a particular large face
 list.
 @param start [String] Starting face id to return (used to list a range of
 faces).
 @param top [Integer] Number of faces to return starting with the face id
 indicated by the 'start' parameter.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [Array] operation results.