The issue is that in `chunks.rs`, `sep_iter` is relative to `search_start`.
But the returned value needs to be absolute position relative to the `buffer`.
sort -m takes: 3 lines, 96003 bytes
and emits: 4 lines, 96004 bytes
The output line lengths before the fix are:
```
a x 32000
b x 23809
b x 8191
c x 32000
```
So it splits one of the lines into two (23809 + 8191 = 32000).
In addition, the output becomes unsorted because the shorter 'b' fragment sorts before the longer 'b' fragment.
The issue is that in `chunks.rs`, `sep_iter` is relatve to `search_start`. But the returned value needs to be absolute position relative to the `buffer`.
We end up with these particular numbers because
- in merge.rs, initial chunk is created as `RecycledChunk::new(8 * 1024)` (8192 bytes)
- `search_start = 8192`; newline is at absolute buffer index `32000`
- `memchr_iter` returns `32000 - 8192 = 23808`, and newline adds + 1 byte
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