[Dbix-class] Unique constraint isn't good enough for update_or_create?

[Sean McAfee]

I have a table that doesn't have a primary key, but does a unique index.
When I call update_or_create on this table, I can create the row just fine,
but when I try to update it with a second call, this exception gets thrown:

Cannot safely update a row in a PK-less table

But the documentation for DBIx::Class::ResultSet explicitly says that the
method can use unique constraints.  So why isn't it?
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