P.S. Actually it just a coincidence that in my use case I am not concerned with let say trees, but with "Records" in a "Table", which in contrast map somehow nicely to IPersistentMap (where I can put a lot of additional functionality in a transparent way) and a "Table" (where the sequence functions built in sequence functions actually desintegrate the "Table", which is undesired for me) which _could_ map to a "IPersistentVector", which makes me desire to have them as transparent to the rest of Clojure as possible and let them act as if the user would actually use vectors and maps and invoke additional functionality only when needed, while all the internal accounting/maintenance of the table of records is hidden from the user. I wanted that it is more like a vector of maps and not a Clojure sequence of maps, because the vector abstraction has some useful (not for databases in general, but but my specific use case) properties and because it is already extensible through the Clojure's collection protocols. On the other side (outside of Clojure) I could aim to maintain the other abstraction of lazy/chunked sequences which are produced by Clojure's sequence functions, but then again have to restitch them to "Table"-s and there is no protocol for it. On the third side one could think of a Table which always has at least some primary key - then one would rather use IPersistentMap for the Table itself, but this again doesn't provide a transparent solution for the sequence functions. And so on and so on. I just miss the glue which in all these cases, which would allow me to give to the end user a fully maintained and consistent "Table" without forcing him into wrapper functions or do-it-yourselfs instead of using the built ins - I wanted that for the end user only an implementation is different, but the whole interface remains pure Clojure :)
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