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As of iOS 18.2 (beta 2), when all shard configurations are identical,
PIR Fixed Shard Configallows for a more compact PIR config, saving bandwidth and client-side memory usage. To enable, set thepirShardConfigsfield in the PIR config. iOS clients prior to iOS 18.2 will still require theshardConfigsfield to be set. See Reusing PIR Parameters for how to process the database such that all shard configurations are identical.