cascader的options.value只接受string类型不合理，应该支持string和number

[kotoyo1516]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.3.5

Environment

chrome74 vue 2.6

Reproduction link

Steps to reproduce

给cascader组件的optons传入[
{
label: "权限管理",
value: 30004,
children: [{ label: "菜单1", value: 30008 }]
},
{ label: "角色管理", value: 30005 },
{ label: "资源管理", value: 30006 }
]

What is expected?

没有warning提示

What is actually happening?

warning提示

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.