Move the `cache_on_disk` check out of `try_load_from_disk_fn`. It doesn't need to be in there, it can instead be at the single call site. Removing it eliminates one parameter, makes `define_queries!` smaller (which is always good), and also enables the next commit which tidies up profiling. This commit also changes how `value` and `verify` are initialized, because I don't like the current way of doing it after the declaration.
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