2B0E..2B13    ; valid                  ;      ; NV8    # 4.1  RIGHTWARDS ARROW WITH TIP DOWNWARDS..SQUARE WITH BOTTOM HALF BLACK
2B14..2B1A    ; valid                  ;      ; NV8    # 5.0  SQUARE WITH UPPER RIGHT DIAGONAL HALF BLACK..DOTTED SQUARE
2B1B..2B1F    ; valid                  ;      ; NV8    # 5.1  BLACK LARGE SQUARE..BLACK PENTAGON

        `tf.data.Dataset.enumerate`.
    *   Promoting `tf.data.experimental.unbatch` to core as
        `tf.data.Dataset.unbatch`.
    *   Adds option for introducing slack in the pipeline to reduce CPU
        contention, via `tf.data.Options().experimental_slack = True`
    *   Added experimental support for parallel batching to `batch()` and
        `padded_batch()`. This functionality can be enabled through
        `tf.data.Options()`.