#5367 WordPress Cookie Authentication Vulnerability takes us back to when the modern password handling in WordPress was born, partially due to a vulnerability report at the time. More because we were ready for it. It’s great to read through and watch decisions being made as familiarity grew.
#23907 Scandinavian ligatures transcribed wrong in remove_accents() is a good read on Scandinavian letters and ligatures as well as some of the differences between Swedish, Norwegian, Danish, and Finish alphabets.
#7875 consolidate plugin/theme/core upgrade/install functions is a great read on the birth of modern WordPress upgrade code that occurred 4.5 years ago in .