What is the checklines parameter?

[dmjones]

The docs for DiffMain and DiffMainRunes don't explain what the checklines parameter is used for.

Digging through the source, it looks like this has an impact on how the diff is calculated, if the input is large enough. But I'm unclear the pros and cons for choosing this.

Happy to make a PR to update the documentation if someone can advise on the use?

[sergi]

From Java docs:

@param checklines Speedup flag. If false, then don't run a line-level diff first to identify the changed areas. If true, then run a faster slightly less optimal diff.

It would be great if you update the documentation with its definition!