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

close #2245

packages/runtime-core/__tests__/helpers/renderList.spec.ts

@@ -21,6 +21,13 @@ describe('renderList', () => {
     ])
   })
 
+  it('should warn when given a non-integer N', () => {
+    renderList(3.1, () => {})
+    expect(
+      `The v-for range expect an integer value but got 3.1.`
+    ).toHaveBeenWarned()
+  })
+
   it('should render properties in an object', () => {
     expect(
       renderList(