Is there a way of giving a type defined with `deftype` internal member 
variables? E.g. not passed explicitly in the constructor.

With `reify`, we can use a closure 
<http://stackoverflow.com/a/41197353/864684>:

(let [ctx (atom nil)
      kv-store (atom nil)]
  (reify Processor
    ;; ...
    (init [this context]
      (reset! ctx context)
      (reset! kv-store (.getStateStore context "Counts")))
    ;; ...
    ))

It's not clear how this can be done with `deftype`, however.

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