Concrete and human-readable here, which is exactly what I expected to get coming from IT (with short job cycles, high turnover, comparatively low wages) where my guiding principle is not being a dick to the next person by making sure they understand why I did things a given way, and where time to learn new things is very much a “thrown in the fire” type scenario (e.g., learning Asterisk while your global support line is down and your contractor holds non-regional business hours for support).