fix(v-for): handle and warn when v-for receives non-integer range number (#2247)

close #2245

packages/server-renderer/__tests__/ssrRenderList.spec.ts

@@ -24,6 +24,13 @@ describe('ssr: renderList', () => {
     expect(stack).toEqual(['node 0: 1', 'node 1: 2', 'node 2: 3'])
   })
 
+  it('should warn when given a non-integer N', () => {
+    ssrRenderList(3.1, () => {})
+    expect(
+      `The v-for range expect an integer value but got 3.1.`
+    ).toHaveBeenWarned()
+  })
+
   it('should render properties in an object', () => {
     ssrRenderList({ a: 1, b: 2, c: 3 }, (item, key, index) =>
       stack.push(`node ${index}/${key}: ${item}`)