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5800ce8ddd
test_range_tombstones_v2 is too strict for this reader -- it expects a particular sequence of `range_tombstone_change`s, but multishard_combining_reader, when tested with a small buffer, may generate -- as expected -- additional (redundant) range tombstone change pairs (end+start). Currently we don't observe these redundant fragments due to a bug in `evictable_reader_v2` but they start appearing once we fix the bug and the test must be prepared first. To prepare the test, modify `flat_reader_assertions_v2` so it squashes redundant range tombstone change pairs. This happens only in non-exact mode. Enable exact mode in `test_sstable_reversing_reader_random_schema` for comparing two readers -- the squashing of `r_t_c`s may introduce an artificial difference.