@eagleoutice/flowr - v2.15.8
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    WrittenBuiltinDefinitions: [
        {
            assumePrimitive: true;
            names: [Identifier];
            type: "constant";
            value: null;
        },
        {
            assumePrimitive: true;
            names: Identifier[];
            type: "constant";
            value: { type: symbol };
        },
        {
            assumePrimitive: true;
            names: [Identifier];
            type: "constant";
            value: number;
        },
        {
            assumePrimitive: true;
            names: Identifier[];
            type: "constant";
            value: { type: symbol };
        },
    ] = ...

    Contains the built-in definitions recognized by flowR, as they are written down: DefaultBuiltinConfig is what markGenerics makes of them, and a test checks that this is all it changes.