Iztok Fister Jr.

## Review checklist for @firefly-cpp ### Conflict of interest - [x] I confirm that I have read the [JOSS conflict of interest (COI) policy](https://github.com/openjournals/joss/blob/master/COI.md) and that: I have no COIs...

@matthewfeickert, Thanks for reminding me. I really hope to finish my review by the end of this week.

It looks good to me. Hence, it got the green light from my side. Congratulations, @LaurenzBeck, for your precious work.