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<ordered_relation_foo>
<b>2</b>
...
<a>3</a>
<a>5</a>
</ordered_relation_foo>

$ordered_relation_foo={
    _meta_order=>[b,b,a,b,a,a],
    b=>[2,4,6],
    a=>[1,3,5]};

$ordered_relation_foo{a}