refactor: simplify next_to_fill state in out-of-order progress policy #24725
+4
−5
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The out-of-order progress saving policy was storing next_to_fill as HashMap<String, Option>, but the value was always initialized and updated as Some(u64) and then immediately unwrapped on read. This change removes the unnecessary Option layer and stores next_to_fill as HashMap<String, u64> directly, eliminating redundant unwraps and simplifying the internal state without changing behavior.