If you are using longtail as a lib you need to switch from `Longtail_ChangeVersion()` to `Longtail_ChangeVersion2()` and use `Longtail_CreateConcurrentChunkWriteAPI`. It is that you drop the LRU block store layer is becomes redundant and only adds memory overhead.
Very happy with how this turned out

Turns out the new strategy is significantly simpler, uses less memory, reduces file I/O, cuts down on CPU usage and drastically reduces wall time to write a new version when it contains files larger than a single block.

The implementation was focused sequential writes of files that caused huge amount of extra I/O, memory and CPU work to be done.
Now, realizing that I don't *need* to write big files from start to finish, but instead I can write the parts in any order, I got to work implementing a new strategy.

Just before the holiday break at work I noticed that writing a version from an archive containing files larger than a single block was **very** slow - like, slow as in "this can't be right".
But it was.