[BUG] iter_start_seqnum does not work with backward iteration
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Description
https://github.com/facebook/rocksdb/blob/e45673deceedc96b9b715679129ec67d3d1c7cdc/db/db_iter.cc#L74
from ReadOptions' comment (or manual), **iter_start_seqnum** should work well for both forward and backward iteration.
I tried but find this parameter does not work inbackward iteration, by digging into the db_iter.cc, it seems this parameter is implemented partially, only for forward iteration.
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