igpapi — Instagram private API Simulator for Node.js (API reference) 4.14.0
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    Variable FeedTimelineUnknownEntrySchemaConst

    FeedTimelineUnknownEntrySchema: Struct<
        {
            item: Struct<
                {
                    kind: Literal<"unknown">;
                    kindKey: optionalKey<String>;
                    raw: Codec<Json, Json, never, never>;
                },
            >;
            key: String;
            position: Number;
            type: Literal<"unknown">;
        },
    > = ...

    An entry of a kind the library does not model: the server's list is an open union, so the entry is kept as the answer's explicit unknown item (item: the kind's top-level key and the whole entry as raw) and the page still opens. Its own key is made from that kind key and the entry's index in the page — an entry the library cannot read has no id the library can trust — so two entries never share a key. Nothing is sent from it.