code: func ORBytes(dst, a, b []byte) int {
  	if supportsUnaligned {
  		return fastORBytes(dst, a, b)
  	}
  	return safeORBytes(dst, a, b)
  }
docs: // ORBytes ors the bytes in a and b. The destination is assumed to have enough
  // space. Returns the number of bytes or'd.