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    Variable DEFAULT_SORT_BYConst

    DEFAULT_SORT_BY: Record<FeatureKind, string> = ...

    The sort the client sends when the caller gives none. The BfS layers have no primary key, so GeoServer refuses any startIndex on an unsorted query with HTTP 400 ("Cannot do natural order without a primary key"). Sorting every query by a stable key makes paging work and keeps pages consistent with an unpaged --max request: kenn is unique per station in latest, and kenn,end_measure orders a time series oldest first, station by station (the order the service used anyway). A caller's own sortBy replaces it.