Initialize the reader when reloading from disk #407
Merged
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Some very light renames;
BookmarkValueandBufferReaderHeadcarry the same data with the same semantics, albeit in different contexts. Once it becomes possible to advance the reader to a bookmark value there's not a huge win keeping them separate, so I've collapsed them to help tie the two areas together.AdvanceTo()makes it possible to set the read position to an invalid offset (beyond the end, or mid-payload), but since this is already expected to be handled for invalid data I've skipped any additional validation there.