Hi Michael, thanks for the explanation on the key attribute. I ended up 
misunderstanding it at first, but it seems to work now.

I had a few problems when I tried to use a  UserDefinedType (e.g. 
geoalchemys Geometry) in the typemap, because it complained about a missing 
"key" attribute. I've fixed that by adding "key = None" to the comparator 
class though (
https://github.com/Turbo87/geoalchemy2/commit/264c7cd578da78c5c5f964ecd44c35a307923643)
 
and it seems to work as expected now :)

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