json-joy
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    CompactCodecDelOperation: [
        op: JsonCrdtPatchOpcode.del,
        obj: CompactCodecTimestamp,
        what: CompactCodecTimespan[],
    ]

    The "del" operation deletes contents from list CRDT (RGA) data types, such as "str", "bin", and "arr". The what property specifies the ranges of contents to delete.