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Each reftable addition has an associated update_index. While writing refs, the update_index is verified to be within the range of the reftable writer, i.e. `writer.min_update_index <= ref.update_index` and `writer.max_update_index => ref.update_index`. The corresponding check for reflogs in `reftable_writer_add_log` is however missing. Add a similar check, but only check for the upper limit. This is because reflogs are treated a bit differently than refs. Each reflog entry in reftable has an associated update_index and we also allow expiring entries in the middle, which is done by simply writing a new reflog entry with the same update_index. This means, writing reflog entries with update_index lesser than the writer's update_index is an expected scenario. Add a new unit test to check for the limits and fix some of the existing tests, which were setting arbitrary values for the update_index by ensuring they stay within the now checked limits. Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>