Flatland is an interesting way to think about dimensions. If we were living in a 2D world, anything living in the 3D world would blow our minds and do things we would think should be impossible.

https://en.wikipedia.org/wiki/Flatland

IMHO the correct way to handle leap seconds would have been at the same layer as timezones, i.e. a display-only thing. Timezone databases are regularly updated, you push out leap second updates there. In the worst case, people's clocks are off by one second but all the underlying timing logic doesn't crash.

TL;DR: "while a new jail in Nashville was still under construction, staff discovered missing keys and other anomalies. Surveillance footage eventually revealed that someone had repeatedly disguised themselves as a construction worker and entered the building many times. Inside, they hid weapons, tools, and escape items in walls and rooms around the facility."

Flash died once people no longer had a flash player. The tooling might also need updating if the apps being built are targeting today’s touch devices.

Are you familiar with the kids story book Iggy Peck Architect by Andrea Beaty? Same story, with a happy ending though.