I believe that OpenJPA will allow float pk fields, it's just that  
there's no built-in id class for them (see util.LongId, ShortId,  
etc).  So you'd have to either add a built-in id class and alter  
OpenJPA's internal code to use it appropriately, or create your own  
id class and use it via the @IdClass annotation, as you would for a  
compound pk.

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