mlx-bun library API
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    interface WeightsOpenOptions {
        native?: WeightsNativeBindings;
        openShards?: (modelDir: string) => Promise<ShardedSafetensors>;
    }
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    Failure-injection seam; production callers use the native MLX bindings.

    openShards?: (modelDir: string) => Promise<ShardedSafetensors>

    Parser seam used by ownership tests to provide deterministic shard order.