Hello Group,

After looking over the 0.5 migration notes and seeing that implicit
ordering is to be removed, it seems to me that it might make sense to
change the default collection class for unordered relations from a
list to a multiset.  This would reinforce that unless order_by is
specified, one cannot rely on a collection having a particular order.
I could see this as helpful in preventing bugs when switching between
databases (e.g. from MySQL to PostgreSQL) with different default
ordering behaviors.

Regards,
Nick
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