* either the field is absent or cannot be parsed as a date.
   */
  @Suppress("NewApi")
  @IgnoreJRERequirement // Only programs that already have Instant will use this.
  fun getInstant(name: String): Instant? = getDate(name)?.toInstant()

  /** Returns the number of field values. */
  @get:JvmName("size")
  val size: Int
    get() = namesAndValues.size / 2

  @JvmName("-deprecated_size")