code: func sliceOutMilestoneIndexField(data []byte) []byte {
  	indexOfMilestoneIndex := bytes.LastIndex(data, milestoneIndexKey[:])
  	if indexOfMilestoneIndex == -1 {
  		return data
  	}
  	c := make([]byte, len(data))
  	copy(c, data)
  	return append(c[:indexOfMilestoneIndex-2], closingCurlyBraceAscii)
  }
docs: // slices out a byte slice without the milestone index field for get balances calls.
  // even when querying multiple nodes with the same reference, the IRI node's latest snapshot index
  // is returned in the response, which must thereby be filtered out.