How LiteDB provides serializability for reads without locks?

[AntyaDev]

Hi, LiteDb community!

I have a question regarding LiteDB's Concurrency Control. After reading the docs, I found that LiteDB is using one single writer per collection and multiple readers without locks. My question is:

1. How LiteDB guaranteed serializable reads without locks? What algorithm is used for this? I have checked the Index implementation and it seems to me that it's not thread-safe.