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Such set does not guarantee deterministic hash\r\nordering. The array returned by its toArray may be sorted differently\r\nat each run. This caused some repeatability issues in our tests (see #29080)\r\nas we pick random fields from the array of possible metadata fields,\r\nbut that won't be repeatable if the input array is sorted differently at\r\nevery run. Once setting the tests seed, hppc picks that up and the sorting is\r\ndeterministic, but failures don't repeat with the seed that gets printed out\r\noriginally (as a seed was not originally set).\r\nSee also https://issues.carrot2.org/projects/HPPC/issues/HPPC-173.\r\n\r\nWith this commit, we simply create a static sorted array that is used for\r\n`getAllMetaFields`. 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