export function defmulti<A, B, C, D, E, F, T>(
    f: DispatchFn5O<A, B, C, D, E, F>,
    rels?: AncestorDefs,
    impls?: IObjectOf<Implementation5O<A, B, C, D, E, F, T>>
): MultiFn5O<A, B, C, D, E, F, T>;