let summary = "Decomposes ops of the 'Optional' family";
  let description = [{
    Turns OptionalFromValue, OptionalGetValue, OptionalNone,
    and OptionalHasValue into identities.

    For example, if we have:

      %1 = "tf.OptionalFromValue"(%0) : (tensor<f32>) -> !tf_type.variant
      %2 = "tf.OptionalGetValue"(%1) : (tensor<!tf_type.variant>) -> tensor<f32>

    then after the pass, this will have been transformed to: