Dear Sir,
I'm a new rustacean so sorry if my questions are a little amateur! I really love the concept of moka and what you've built, it is exactly what I was searching for!

I would like to integrate multiple async / future caches with different TTL & capacities, to run on my actix web server.

I have two key questions I would like to ask:

1. I would love to use moka futures as a counter, however I noticed that there isn't an alternative for the classic "entry API" found in std::hashmap.
   Like this Reddit example counter.
   The entry API in std::hashmap allows to first search, if not exist insert a default value (e.g start counter at 1) or if it exists, to simply +=1 avoiding two lookups.
   I searched the source code and saw moka cht offers a "insert_or_modify" function which could reproduce this!
   From what I understand, the futures moka library only implements get, get_with and insert, not the moka-cht "insert_or_modify" - so how would I go about approaching building a counter using moka futures?
   Ideally I would love to be able to just do a get and increment the counter if found. However I would be willing to compromise and do a "insert_or_modify" from moka cht library, I'm just not sure how to integrate this into the moka futures library - is insert or modify synchronous? I am assuming it is lower level / upstream?

2. I noticed to enforce the TTL policy we use a housekeeper that runs on "scheduled thread pool", whilst actix web runs a web server app instance on each thread.
   Does this mean that moka cache can be friendly & share the CPU with the actix web server? I have read web servers are blocking operations, so moka housekeeper can integrate itself into this?
   I know you have stated we are fine for actix-rt, however I just wanted some reassurance that multiple caches, let's say 4 caches for example, would be able to share a single CPU with actix web server app? Would this create 4 unique housekeepers that would all share my single thread with my web server?
   I am assuming the cleanup process would spread out and my cloud provider may not be very happy, but as long as it works I'm happy!

Many thanks for your time, amazing work!!! 🙌🏽