Problems with VirtualDom.map

[evancz]

There are a couple issues reported about VirtualDom.map. I am collecting them here so that it is easier to think about them together.

• switching between map f node and node should reuse DOM - DOM mutations are not the same depending on code syntax #14, VirtualDom.map preventing reuse of elements #35
• Bad interaction between lazy and map can cause a crash - Html.map appears to have problems particularly in conjunction with Html.Lazy #73
• Bad interaction between lazy and onblur can break message tagging - Html.map + blur event on DOM removal makes impossible states possible #103, https://github.com/elm-lang/html/issues/119
• using elm_event_node_ref may be unreliable in IE11? - domNode.elm_event_node_ref is undefined in Internet Explorer 11, Edge (early versions)  #101