Return length of overlap in foverlaps

[Henrik-P]

From the not yet implemented argument minoverlap in foverlaps: "...length of overlap between these two intervals is...".

Given that the length of overlaps will be calculated anyway when minoverlap eventually is implemented, wouldn't it be nice to be able to return these lengths, perhaps through an additional argument like e.g. lengthoverlaps = FALSE (default) / TRUE?

I have seen quite a few posts on such overlap widths in genomics (calculated using functions in GenomicRanges, e.g. here, here, and here) and in posts on overlapping date ranges.

I wish to take the opportunity to thank everyone in the data.table team for your fantastic work!

[ZhenyuZ]

I second this request. The length of overlapped region is important for genomics. Although I can easily calculate after I get the output data.table, it will be nice that foverlaps can output it directly.