Multiple cascades should be combined

Hello,

HasMany (OneToManyPart) allows you to specify multiple cascades by doing .Cascade.SaveUpdate().Cascade.Delete()

Line 37 in 85a6839

     collectionAttributes.Set("Cascade", Layer.UserSupplied, current == null ? value : string.Format("{0},{1}", current, value));  
 

HasOne (OneToOnePart) only takes the last cascade option specified.

Line 24 in 85a6839

     cascade = new CascadeExpression<OneToOnePart<TOther>>(this, value => attributes.Set("Cascade", Layer.UserSupplied, value));  
 

Is this by design or a bug?

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