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Includes the changes of #3689 that address point 1 of #3689, plus some further improvements. In particular, this PR does: * set `min_lsn` to a safe value to create branches from (and verify it in tests) * return `min_lsn` instead of `max_lsn` for `NoData` and `Past` (verify it in test for `Past`, `NoData` is harder and not as important) * return `commit_lsn` instead of `max_lsn` for Future (and verify it in the tests) * add some comments Split out of #5686 to get something more minimal out to users.