     /**
     Unarchives a value type if stored at this index
     
-    :param: index The YapDB.Index value.
-    :returns: An optional Value.
+    - parameter index: The YapDB.Index value.
+    - returns: An optional Value.
     */
     public func readAtIndex<
         Value

    /**
    Synchronously reads the Value sored by key in this connection.

    :param: key A String
    :returns: An optional Value
    */
    public func read<
        Value


        let (barcode: [Barcode], missing) = database.filterExisting(keys)

    - parameter keys: An array of String instances
    - returns: An ([Value], [String]) tuple.
    */
    public func filterExisting<
        Value
