- // "ref" field in our VCF.
- del = append([]byte(nil), fields[8]...)
- ins = append(append([]byte(nil), del...), ins...)
- position -= int64(len(del))
+ // "ref" field in our
+ // VCF. Similarly, we record
+ // deletions as "122 TAA T"
+ // rather than "123 AA .".
+ del = append(append(make([]byte, 0, len(fields[8])+len(del)), fields[8]...), del...)
+ ins = append(append(make([]byte, 0, len(fields[8])+len(ins)), fields[8]...), ins...)
+ position -= int64(len(fields[8]))