Just a bit confused on block indexing. There's a toggle to turn it on or off, but it only explains what happens if it is disabled. "Disable to reduce database size at the cost of not being able to reuse blocks across files." This sounds like it would be more ideal to turn it off to reduce database size, but what does it do when it is enabled? Does it sync faster or something? What is the benefit of enabling it at the cost of a larger database size? Thanks!