@traversable/schema
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    Variable foldConst

    fold: <T>(
        g: (src: t.F<T>, ix: t.Functor.Index, x: t_Schema) => T,
    ) => {
        (src: t.F<T>, ix?: t.Functor.Index): T;
        (src: t_Schema, ix?: t.Functor.Index): T;
        (src: t.F<T>, ix?: t.Functor.Index): T;
    } = ...

    Type declaration