It's relatively rare that people write variants of Clojure data structures. 
 Partially, this is because the existing data structures are quite good, 
but it's also because it's surprisingly difficult.  Clojure's vectors, 
sets, and maps each implement about a dozen interfaces with overlapping 
functionality, making it easy to think you've written something correct 
until someone accesses it in a way you didn't think to test.  I have 
written a number of alternate data structures [1] [2] [3], and each time 
there's been some lacunae of the standard API that I overlooked.

To make this easier for myself and others, I've written a library for the 
express purpose of validating data structures that are extensions of the 
standard three data 
structures: https://github.com/ztellman/collection-check.  It's already 
uncovered some minor bugs in my own libraries, as well as an issue with 
Clojure's own hash-sets and hash-maps [4].  I strongly encourage anyone 
who's playing around in this space to use it, and to let me know if there 
are invariants I've overlooked.

Enjoy,
Zach

[1] https://github.com/ztellman/clj-tuple
[2] https://github.com/ztellman/immutable-bitset
[3] https://github.com/ztellman/potemkin
[4] https://groups.google.com/forum/#!topic/clojure-dev/HvppNjEH5Qc

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