> It wasn't the cast that felt funny to me, it was the role of 0_u32 in the 
> expression.  Its only purpose is to give access to the date impl over u32 
> which is ok, but I'm used to having something like class methods for that.

Right. As I said, just use constructor functions with different names.
We may end up supporting this directly in our class system at some
point, but that seems an easy enough workaround.
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