The gamFactory 📦 is doing some very interesting things wrapping mgcv and contains three new smoother types. @mfasiolo has support for gamFactory gam_nl() models in the devel version of his mgcViz 📦. By the looks of things, these models are common-or-garden mgcv GAMs but with some additional post processing, so it shouldn't take too much to add support to gratia for gamFactory::gam_nl().

Investigate what it would take implement this.

Note-to-self: add sub-issues as needed to fill out support once I've figured out what's needed.