A cute systemd feature to get the system clock roughly correct: if the system time is before the compilation time of the systemd binary, it moves the clock forward to that time!
Really elegant developer tool: Go's inline IDE feature is used with deprecation markers, so call sites are autofixed from OldApi() to NewApi() based on the implementation of OldApi.
Is there a good term for "after using this feature we realised that the best design is different from the current design"?
In casual conversation I generally hear "bug" but there was nothing wrong with the original implementation.
Today I learnt about "bypass charging", a phone feature where it can run directly off the mains without using the battery at all. No battery charging, less heat, less battery wear. Nifty.