stable first
   version: [1]https://lists.cpunks.org/pipermail/cypherpunks/2022-July/10
   2291.html
   attached appears to have comparable performance to first version. i
   tried to implement all the same approaches (did not check for certain),
   except without all the O(n) simplifications and updating the index
   every write to help decide when to flush. I noticed the branch merging
   code is never hit, should try to figure out what data would make it get
   used or if it is redundant or has a further mistake.

References

   1. https://lists.cpunks.org/pipermail/cypherpunks/2022-July/102291.html