handle enumerated attrs

src/runtime/vdom/modules/attrs.js

@@ -1,11 +1,12 @@
 import { makeMap } from '../../../shared/util'
 
+const isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck')
 const isBooleanAttr = makeMap(
   'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
-  'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,draggable,' +
+  'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
   'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
   'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
-  'required,reversed,scoped,seamless,selected,sortable,spellcheck,translate,' +
+  'required,reversed,scoped,seamless,selected,sortable,translate,' +
   'truespeed,typemustmatch,visible'
 )
 
@@ -27,6 +28,8 @@ function updateAttrs (oldVnode, vnode) {
         } else {
           elm.setAttribute(key, key)
         }
+      } else if (isEnumeratedAttr(key)) {
+        elm.setAttribute(key, cur == null ? 'false' : 'true')
       } else {
         elm.setAttribute(key, cur)
       }