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There was a discussion on the mailing list concerning colon in maps, here's the JIRA issue [1]. IIRC it was kind of decided to let it die, but maybe someone will implement it.

Personally I think that differentiating between lists and maps is important and the way Clojure does it (as well as JSON) is quite easy to write and read. FWIW example given by bitcracker is broken because there's no way to understand what does the following mean:

   (rels (author 9) (comments (5 12 17 20)))
The outermost element is it a list or a map?

[1] http://dev.clojure.org/jira/browse/CLJ-899




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