O(1) LRU in Rust - a deep dive by @xand

This turned out to be a harder task than I expected, pushing me to dive deeper into smart pointers than any of my day-to-day Rust situations, but I managed and want to share what I learned.

Come join me for a small group discussion at Red Oak conference room (whiteboard + big screen) and perhaps some beers afterwards.

Rough schedule:
17:30 - 18:00: arrivals (ping @xand on Discord for help getting in)
18:00 - 20:00: presentation and discussion
20:00 - XX:XX: dinner/beers

Rough outline:
- problem statement
- obvious solutions and why they come up short
- complete solution and why it is hard
- reduced problem and live coding a simpler solution (time permitting)