em rexer

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## Review checklist for @erexer ### 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...

@kyleniemeyer As Chris said I was out the past couple of weeks but I'll be reviewing w2w this week. Thanks for your patience!