anchor.diff:          | OnExit of (Browser.HTMLElement -> unit)
           | OnExiting of (Browser.HTMLElement -> unit)
           | OnExited of (Browser.HTMLElement -> unit)
  -        | Children of U2<React.ReactNode, (TransitionStatus -> React.ReactNode)>
  +        | Children of U2<React.ReactElement, (TransitionStatus -> React.ReactElement)>
           | Class of string
           | Ref of (obj -> obj)
           | Key of string
  
positive.code:         static member Custom(key: string, value: obj): TransitionGroupProp =
              unbox(key, value)
  
      let private asNode (el: React.ReactElement): React.ReactNode =
          !^(!^el: React.ReactChild)
  
      let transition (props: TransitionProp list) (child: React.ReactElement): React.ReactElement =
          let props = (TransitionProp.Children !^(asNode child))::props
          ofImport "Transition" "react-transition-group" (keyValueList CaseRules.LowerFirst props) []
  
      let transitionWithRender (props: TransitionProp list) (render: TransitionStatus -> React.ReactNode): React.ReactElement =
          let props = (TransitionProp.Children !^render)::props
          ofImport "Transition" "react-transition-group" (keyValueList CaseRules.LowerFirst props) []
  
      let cssTransition (props: CSSTransitionProp list) (child: React.ReactElement): React.ReactElement =
          let props = (CSSTransitionProp.Children !^(asNode child))::props
          ofImport "CSSTransition" "react-transition-group" (keyValueList CaseRules.LowerFirst props) []
  
      let cssTransitionWithRender (props: CSSTransitionProp list) (render: TransitionStatus -> React.ReactNode): React.ReactElement =
          let props = (CSSTransitionProp.Children !^render)::props
          ofImport "CSSTransition" "react-transition-group" (keyValueList CaseRules.LowerFirst props) []
  
  
negative.code:         | OnExit of (Browser.HTMLElement -> unit)
          | OnExiting of (Browser.HTMLElement -> unit)
          | OnExited of (Browser.HTMLElement -> unit)
          | Children of U2<React.ReactElement, TransitionStatus -> React.ReactElement>
          | ClassNames of U2<string, CSSTransitionClassNames>
          | Class of string
          | Ref of (obj -> obj)
  