pub const UNORDERED: u32 = u32::MAX; // 4_294_967_295u32Expand description
No layout on this node: whoever builds the record sorts it, as it did before this pass existed.
It cannot collide with a real layout. Every nibble of one is a written field’s index, which is
below MAX_ORDERED, so no layout has 0xf anywhere and this one is 0xf everywhere.