   ###
   findOne: (selector, options) ->
     console.info "[FilesCollection] [findOne(#{JSON.stringify(selector)}, #{JSON.stringify(options)})]" if @debug
-    check selector, Match.Optional Match.OneOf Object, String, Boolean, null
+    check selector, Match.Optional Match.OneOf Object, String, Boolean, Number, null
     check options, Match.Optional Object
 
     selector = {} unless arguments.length

  ###
  find: (selector, options) ->
    console.info "[FilesCollection] [find(#{JSON.stringify(selector)}, #{JSON.stringify(options)})]" if @debug
    check selector, Match.Optional Match.OneOf Object, String, Boolean, null
    check options, Match.Optional Object

    selector = {} unless arguments.length

      EventEmitter.call @
      console.info '[FilesCollection] [insert()]' if @collection.debug
      self                     = @
      @config.ddp             ?= @collection.ddp
      @config.meta            ?= {}
      @config.streams         ?= 2
      @config.streams          = 2 if @config.streams < 1
