I do not understand this change. Even for unordered collections, there is a 
order, which is the order in which the nodes are returned by the collection() 
function. According to the XQDDF spec, the collection() function is stable, 
i.e., within a snapshot will always return the results in the same order, which 
by definition, coincides with the document order for the nodes in the 
collection. Furthermore, the XQDDF spec says that the result of idex probing 
functions is always in document order.

What is the problem that this change is supposed to fix?
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