CombinedField8
constructor(label: String, field1: MutablePreviewLabField<A>, field2: MutablePreviewLabField<B>, field3: MutablePreviewLabField<C>, field4: MutablePreviewLabField<D>, field5: MutablePreviewLabField<E>, field6: MutablePreviewLabField<F>, field7: MutablePreviewLabField<G>, field8: MutablePreviewLabField<H>, combine: (A, B, C, D, E, F, G, H) -> Value, split: (Value) -> Splited8<A, B, C, D, E, F, G, H>)