Thank everybody for the discussion. I am now aware of some pitfalls in
using defrecord.
For me, I like to have type information associated with my data. I still
prefer defrecord over map in general, but I will proceed with more caution.
I think some pitfalls here are not due to the greatness of regular map, but
is because record is not yet so great (e.x. Python has no problem
serializing typed data). But still, with current state of things, those
downsides are real.
By the way, it seems record is not necessarily slower than map in map
operations. Here is my test result:
(defrecord myrec [a b])
(def rec (myrec. 1 2))
(def m {:a 1 :b 2})
user=> (time (dotimes [x 10000000] (assoc m :a 4)))
"Elapsed time: 2499.155478 msecs"
user=> (time (dotimes [x 10000000] (assoc rec :a 4)))
"Elapsed time: 802.191248 msecs"
But I did not test other operations.
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