> PostGIS is a great database and its foundational data type is geography.

Hate to "well ackchyually" the author here, but I'm gonna. The foundational data type in PostGIS is not geography, but geometry. geography is geodetic layer on top of geometry. I honestly don't use geography that much because it only supports a subset of the geometry functions.

Thanks for the callout! I have much more experience with geography but you’re totally right. I’ll add a note