the ctrie

"SIEVE is a cache eviction algorithm that decides what to keep in the cache and what to discard.
It achieves both simplicity and efficiency."
source: https://sievecache.com/
paper : https://junchengyang.com/publication/nsdi24-SIEVE.pdf

example usage:
cache0 := lock_free.Sieve_Cache String i32 3
say <| cache0.access "A" ()->1 # => 1
say <| cache0.access "B" ()->2 # => 2
say <| cache0.access "C" ()->3 # => 3
say <| cache0.access "A" ()->4 # => 1
say <| cache0.access "D" ()->5 # => 5
say <| cache0.access "C" ()->6 # => 3

lock-free stack using compare_and_set
invented by R. Kent Treiber