code: func finishV1(w *bstream) {
  	w.writeBits(0x0f, 4)
  	w.writeBits(0xffffffff, 32)
  	w.writeBit(zero)
  }
docs: // see end-of-stream marker information in devdocs/chunk-format.md
  // finishV1 writes a v1 end-of-stream record to the bitstream