This one took me a few minutes to see what I was doing wrong:
~~~
user=> (def m (atom {:x 1 :y 2}))
#'user/m
;; Later on ...
user=> (get m :x)
nil
;; What?? `:x` isn't a key in `m`? But I *know* it is...
;; Sanity check, for comparison:
user=> (get {:a 1 :b 2} :c) ; Right; `:c` is not a key in there, so I
get `nil`.
nil
;; Time passes and I eventually see the typo:
user=> (get @m :x)
1
~~~
Would be nice if that `(get m :x)` yielded an error message along the lines
of, "That's not a map, it's a reference to an atom containing a map."
-- John
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