aleph/manifold resource leak

deps

[aleph "0.4.0-beta2"]
 [byte-streams "0.2.0-alpha8"]
   [clj-tuple "0.1.7"]
   [primitive-math "0.1.4"]
 [io.aleph/dirigiste "0.1.0-alpha6"]
 [io.netty/netty-all "4.0.25.Final"]
 [manifold "0.1.0-beta9"]
   [riddley "0.1.7"]
 [org.clojure/tools.logging "0.3.1"]
 [potemkin "0.3.11"]
[org.clojure/tools.trace "0.7.8" :scope "test"]

weirdness.clj

(ns weirdness
  (:require [aleph.http :as http]
            [byte-streams :as bs]
            [clojure.tools.trace :as t]
            [manifold.deferred :as d])
  (:import (java.util.concurrent TimeoutException)))

(t/trace-vars aleph.http/create-connection)

(defn lookup [url]
  (-> (d/timeout! (http/get url) 500)
      (d/chain :body
               bs/to-string
               #(hash-map :body %))
      (d/catch TimeoutException
        (fn [e] {:error e :url url}))))

(comment
  (lookup "http://foo.unreachable")

  )