sliceToByte and getByte are broken

[HuwCampbell]

Hello

Here is the getByte function

  private def getByte(start: Long, bits: Int, signed: Boolean): Byte = {
    require(sizeGreaterThanOrEqual(start + bits) && bits >= 0 && bits <= 8)
    var result = 0x0ff & getByte(0)
    if (bits != 0) result = result >>> (8 - bits)
    // Sign extend if necessary
    if (signed && bits != 8 && ((1 << (bits - 1)) & result) != 0) {
      val toShift = 32 - bits
      result = (result << toShift) >> toShift
    }
    result.toByte
  }

One can see that on the 3rd line it calls getByte(n: Long) which in turn looks up the underlying, but, it calls it with 0; not the start byte.