code: @NonNull
      public <E extends T> MapperBuilder<T> bind(@NonNull Class<E> itemClass,
                                                 @NonNull Binder<? super E, ?> binder) {
          //noinspection unchecked
          return bind(itemClass, 0, binder, ALWAYS);
      }
docs: Map an item type to the specified binder.
  @param itemClass The type of item accepted by the specified binder.
  @param binder The binder to be used to bind the specified item type.
  @return This builder, to allow chaining.