   describe "Works also when f returns a Property instead of an EventStream", ->
     expectStreamEvents(
       -> series(1, [1,2]).flatMap(Bacon.constant)
-      [1,2], {unstable:true})
+      [1,2], unstable)
   describe "Works also when f returns a constant value instead of an EventStream", ->
     expectStreamEvents(
       -> series(1, [1,2]).flatMap((x) -> x)
-      [1,2], {unstable:true})
+      [1,2], unstable)
   describe "Accepts a constant EventStream/Property as an alternative to a function", ->
     expectStreamEvents(
       -> Bacon.once("asdf").flatMap(Bacon.constant("bacon"))

        Bacon.when(
          [as, bs, cs], (a,b,c) ->  a + b + c,
          [as],         (a)   ->  a)
      ['a', 'ab0', 'a', 'ab1', 'ab2', 'ab3'], {unstable:true})
  describe "doesn't output before properties have values", ->
    expectStreamEvents(
      ->

        Bacon.when(
          [hs, hs, os], (h1,h2,o) ->  [h1,h2,o],
          [cs, os],    (c,o) -> [c,o])
      [['h', 'h', 'o'], ['c', 'o'], ['h', 'h', 'o'], ['c', 'o']], unstable)
  describe "works with multiples of properties", ->
    expectStreamEvents(
      ->
