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5928f6709c
Many tests like `test_live_migration` or `test_timeline_deletion_with_files_stuck_in_upload_queue` set `compaction_threshold` to 1, to create a lot of changes/updates. The compaction threshold was passed as `fanout` parameter to the tiered_compaction function, which didn't support values of 1 however. Now we change the assert to support it, while still retaining the exponential nature of the increase in range in terms of lsn that a layer is responsible for. A large chunk of the failures in #6964 was due to hitting this issue that we now resolved. Part of #6768.