fix vuejs#517 v-model[number] initial value

Author: yyx990803

src/directives/model/text.js

@@ -93,7 +93,9 @@ module.exports = {
       el.hasAttribute('value') ||
       (el.tagName === 'TEXTAREA' && el.value.trim())
     ) {
-      this._initValue = el.value
+      this._initValue = number
+        ? _.toNumber(el.value)
+        : el.value
     }
   },
 

test/unit/specs/directives/model_spec.js

@@ -370,11 +370,12 @@ if (_.inBrowser) {
         data: {
           test: 1
         },
-        template: '<input v-model="test" number>'
+        template: '<input v-model="test" value="2" number>'
       })
-      el.firstChild.value = 2
-      trigger(el.firstChild, 'input')
       expect(vm.test).toBe(2)
+      el.firstChild.value = 3
+      trigger(el.firstChild, 'input')
+      expect(vm.test).toBe(3)
     })
 
     it('IE9 cut and delete', function (done) {