Hoping someone might have some insight that can help with this.

I'm using Twitters Typehead (0.9.3, before its big rework) in a 
re-frame/reagent app.

Below is a snippet that works fine when :compile :simple is used, but fails 
when :compile :advanced is used. I'm using the typeahead.js and hogan.js as 
externs. It seems to me that :advanced must be stripping something out the is 
needed, but no clue how to determine what it is and more importantly what to do 
about it. When (js/alert...) is called, the value is undefined under :advanced, 
though the proper object is there, just without values for .-casrn or 
.-common_name. 

    (reagent/create-class
     {:component-did-mount
      (let [params {:name "casrns"
                    :valueKey "casrn"
                    :remote
                    {:url 
"/raw_materials/casrn_cn_auto_complete.json?casrn=%QUERY",
                     :cache true}
                    :limit 20
                    :template "<div style='width:300px'>{{casrn}}: 
{{common_name}}</div>"
                    :engine js/Hogan}]
        (fn [self]
          (js/$
           (fn  [] (.typeahead (js/$ "#casrn") (clj->js params))
             (.on (js/$ "#casrn")
                  "typeahead:selected"
                  (fn  [o, datum]
                    (let [casrn (.-casrn datum)
                          common_name (.-common_name datum)]
                      (js/alert (.-casrn datum))
                      (update :casrn casrn)
                      (update :common_name common_name)
                      (.val (js/$ "#common_name") common_name))))))))

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