> I think Andreas's point is that there's a discontinuity:
>
> 0 required keys: map
> 1 required key:  struct-map
> 2 required keys: struct-map
> ...

That's exactly the point! If I change only a little detail in my
program, this can have impact on a huge part of my program.
I can not see any reason why it is forbidden to use empty defstructs.


> The solution for Andreas, of course: either
>
> * Always use map. The performance impact is small.

And documentary style is lost. Would be ok though, but not optimal.

> * Always have at least one required key in your struct-map, even if  
> you don't actually use it.

That's definitely not a solution but a problem itself.
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