code: @NonNull
      public static <T> Mapper<T> singletonMapper(@NonNull Binder<T, ?> binder) {
          //noinspection unchecked
          return new SingletonMapper<>((Binder<T, View>) checkNotNull(binder, "binder"));
      }
docs: Creates a {@link Mapper} that only ever uses the single supplied {@link Binder}.