So proud of this: Meta Allocator
https://tkammer.de/zisp/doc/0/A-meta_alloc.html
Google Gemini helped with some of the design ideas, but it's mostly me.
The code is also great:
https://git.tkammer.de/zisp/tree/src/zisp/gc/meta_alloc.zig
A nice person who goes by Protty on the Zig discord helped me understand atomic primitives and encouraged me to use lockless data structures which I eventually managed to do.
I've looked over the generated assembly a bit via Godbolt and it seems really lean and efficient.
