clojure structs are an optimized version of maps for a set of shared
keys. if you don't have a defined set of shared keys you just have a
map. so by all means, use a map
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
...
and thus flip-flopping between 0 and n required keys means changing
lots of code.
The solution for Andreas, of course: either
* Always use map. The performance impact is small.
* Always have at least one required key in your struct-map, even if
you don't actually use it.
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