diff --git a/ring-core/src/ring/middleware/multipart_params.clj b/ring-core/src/ring/middleware/multipart_params.clj
index 54aefc1b..0ae6f0e6 100644
--- a/ring-core/src/ring/middleware/multipart_params.clj
+++ b/ring-core/src/ring/middleware/multipart_params.clj
@@ -10,40 +10,33 @@
   (:require [ring.util.codec :refer [assoc-conj]]
             [ring.util.request :as req]
             [ring.util.parsing :as parsing])
-  (:import [org.apache.commons.fileupload UploadContext
-                                          FileItemIterator
-                                          FileItemStream
-                                          FileUpload
-                                          ProgressListener]
+  (:import [org.apache.commons.fileupload
+            UploadContext
+            FileItemIterator
+            FileItemStream
+            FileUpload
+            ProgressListener]
            [org.apache.commons.io IOUtils]))
-(defn- progress-listener
-  "Create a progress listener that calls the supplied function."
-  [request progress-fn]
+
+(defn- progress-listener [request progress-fn]
   (reify ProgressListener
-    (update [this bytes-read content-length item-count]
+    (update [_ bytes-read content-length item-count]
       (progress-fn request bytes-read content-length item-count))))
 
-(defn- multipart-form?
-  "Does a request have a multipart form?"
-  [request]
+(defn- multipart-form? [request]
   (= (req/content-type request) "multipart/form-data"))
 
-(defn- request-context
-  "Create an UploadContext object from a request map."
-  {:tag UploadContext}
-  [request encoding]
+(defn- request-context ^UploadContext [request encoding]
   (reify UploadContext
-    (getContentType [this]       (get-in request [:headers "content-type"]))
-    (getContentLength [this]     (or (req/content-length request) -1))
-    (contentLength [this]        (or (req/content-length request) -1))
-    (getCharacterEncoding [this] encoding)
-    (getInputStream [this]       (:body request))))
-
-(defn- file-item-iterator-seq
-  "Create a lazy seq from a FileItemIterator instance."
-  [^FileItemIterator it]
+    (getContentType [_]       (get-in request [:headers "content-type"]))
+    (getContentLength [_]     (or (req/content-length request) -1))
+    (contentLength [_]        (or (req/content-length request) -1))
+    (getCharacterEncoding [_] encoding)
+    (getInputStream [_]       (:body request))))
+
+(defn- file-item-iterator-seq [^FileItemIterator it]
   (lazy-seq
-    (if (.hasNext it)
+    (when (.hasNext it)
       (cons (.next it) (file-item-iterator-seq it)))))
 
 (defn- file-item-seq [^FileUpload upload context]
@@ -66,10 +59,7 @@
                                                fallback-encoding)))
            v)])))
 
-(defn- parse-file-item
-  "Parse a FileItemStream into a key-value pair. If the request is a file the
-  supplied store function is used to save it."
-  [^FileItemStream item store]
+(defn- parse-file-item [^FileItemStream item store]
   [(.getFieldName item)
    (if (.isFormField item)
      {:bytes    (IOUtils/toByteArray (.openStream item))
@@ -86,10 +76,7 @@
       (.setProgressListener upload (progress-listener request progress-fn)))
     upload))
 
-(defn- load-var
-  "Returns the var named by the supplied symbol, or nil if not found. Attempts
-  to load the var namespace on the fly if not already loaded."
-  [sym]
+(defn- load-var [sym]
   (require (symbol (namespace sym)))
   (find-var sym))
 
@@ -100,7 +87,6 @@
      (func))))
 
 (defn- parse-multipart-params
-  "Parse a map of multipart parameters from the request."
   [request {:keys [encoding fallback-encoding store] :as options}]
   (let [store             (or store @default-store)
         fallback-encoding (or encoding