Adrian Lienhard wrote:
> If the package does not include any traits it should work also in 
> previous images. If this is not the case let me know. Of course if you 
> have traits, you cannot just load that into a pre 3.9 image.

Why not? Wasn't the idea that traits methods get "inlined" when they are 
loaded into older versions? And if it's about the traits definition 
itself, a little compatibility package (introducing class Trait and just 
treat the traits defined in the package as subclasses) should go a long way.

Cheers,
   - Andreas