And this is mine: https://github.com/ademakov/MainMemory https://github.com/ademakov/MainMemory Though it's not a library, but it can be converted into one if

And this is mine: https://github.com/ademakov/MainMemory https://github.com/ademakov/MainMemory Though it's not a library, but it can be converted into one if needed. And it's not so lightweight already and I'm still working on more features.