@traversable/schema
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    Unary:
        | t_eq<t.Unary>
        | t_array<t.Unary>
        | t_record<t.Unary>
        | t_optional<t.Unary>
        | t_union<t.Unary[]>
        | t_intersect<readonly t.Unary[]>
        | t_tuple<t.Unary[]>
        | t_object<{ [x: string]: t.Unary }>