read_seq_count
if (read_seq_count(wc, e) != -1) {
if (read_seq_count(wc, old) == read_seq_count(wc, e)) {
(unsigned long long)read_seq_count(wc, e));
if (read_seq_count(wc, old) > read_seq_count(wc, e)) {
return read_seq_count(wc, e) < wc->seq_count;