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502a45ad58
We define the native reverse format as a reversed mutation fragment stream that is identical to one that would be emitted by a table with the same schema but with reversed clustering order. The main difference to the current format is how range tombstones are handled: instead of looking at their start or end bound depending on the order, we always use them as-usual and the reversing reader swaps their bounds to facilitate this. This allows us to treat reversed streams completely transparently: just pass along them a reversed schema and all the reader, compacting and result building code is happily ignorant about the fact that it is a reversed stream.