sourceCodePoint0 = 0,
          sourceCodePoint1 = 0,
          mappedToCodePoints = listOf(1 shl 18),
        ),
      ),
    ).isEqualTo(null)
  }

  private fun mappingOf(
    sourceCodePoint0: Int,
    sourceCodePoint1: Int,
    mappedToCodePoints: List<Int>,
  ): Mapping =
    Mapping(
      sourceCodePoint0 = sourceCodePoint0,
      sourceCodePoint1 = sourceCodePoint1,
      type = TYPE_MAPPED,

    result +=
      Mapping(
        sourceCodePoint0.toInt(),
        sourceCodePoint1.toInt(),
        type,
        mappedTo.readByteString(),
      )
  }

  return SimpleIdnaMappingTable(result)
}

internal data class Mapping(
  val sourceCodePoint0: Int,
  val sourceCodePoint1: Int,
  val type: Int,
  val mappedTo: ByteString,
) {
  val section: Int

      unionWith = next
      index++
    }

    result +=
      Mapping(
        sourceCodePoint0 = mapping.sourceCodePoint0,
        sourceCodePoint1 = unionWith.sourceCodePoint1,
        type = type,
        mappedTo = mappedTo,
      )
  }

  return result
}

internal fun canonicalizeType(type: Int): Int {
  return when (type) {