etcd3 API - v2.0.0
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    Variable comparatorConst

    comparator: {
        "!=": CompareResult;
        "!==": CompareResult;
        "<": CompareResult;
        "==": CompareResult;
        "===": CompareResult;
        ">": CompareResult;
    } = ...

    Comparators can be passed to various operations in the ComparatorBuilder.