cluster node order

cluster changes nodes order ??

Hi,

I am facing a strange behaviour; with the following specification, nodes are drawn, from left to right, 0 then 1:
graph "test0" {
0;
1;
}

But with a cluster, the nodes are drawn 1 then 0:
graph "test1" {
subgraph cluster0 {
graph [style=invis];
0;
1;
}
}

How could you explain that and ensure the order the nodes are drawn could be mastered ?

Thanks

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