fix: skip v-model & value binding collision check with dynamic type binding (vuejs#7406)

* fix vuejs#7404

Author: Justineo

src/platforms/web/compiler/directives/model.js

@@ -130,9 +130,11 @@ function genDefaultModel (
   const type = el.attrsMap.type
 
   // warn if v-bind:value conflicts with v-model
+  // except for inputs with v-bind:type
   if (process.env.NODE_ENV !== 'production') {
     const value = el.attrsMap['v-bind:value'] || el.attrsMap[':value']
-    if (value) {
+    const typeBinding = el.attrsMap['v-bind:type'] || el.attrsMap[':type']
+    if (value && !typeBinding) {
       const binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value'
       warn(
         `${binding}="${value}" conflicts with v-model on the same element ` +

test/unit/features/directives/model-text.spec.js

@@ -289,6 +289,17 @@ describe('Directive v-model text', () => {
     expect('conflicts with v-model').not.toHaveBeenWarned()
   })
 
+  it('should not warn on input with dynamic type binding', () => {
+    new Vue({
+      data: {
+        type: 'checkbox',
+        test: 'foo'
+      },
+      template: '<input :type="type" v-model="test" :value="test">'
+    }).$mount()
+    expect('conflicts with v-model').not.toHaveBeenWarned()
+  })
+
   if (!isAndroid) {
     it('does not trigger extra input events with single compositionend', () => {
       const spy = jasmine.createSpy()