Suggestion: when you're building a user database, assign each user a 16-digit hexadecimal number as a unique identifier, disallow that internal identifier from changing, and let everything else change.
Want to change your username? Great. Want to change your email? Fine. The unique hex ID is all that matters.
16 hex digits is enough collision space to give every person on earth about 2.5 /million/ accounts on your system, but short enough that you can write it down on a post-it note.
Once again HMD have taken a classic Nokia phone and made it worse
https://www.theverge.com/2018/2/25/17044634/nokia-8110-matrix-banana-phone-mwc-2018
Are you bored of your normal units of measurement?
Try one of these! https://en.wikipedia.org/wiki/List_of_humorous_units_of_measurement
Hedgehog wrangler, cat feeder, octopus whomst love smol critters
"i never thought someone could be such a watch nerd and yet here you are" ~ @maple