formModel中一个表单控件包含两个字段时，prop属性绑定？

[UgineHuang]

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

Version

1.6.1

Environment

chrome

Reproduction link

Steps to reproduce

一个表单控件包含两个字段，如组合输入框，对应input为表单对象的一个变量，前缀slot里的select也是表单对象的一个变量。那对应包含这个控件的
a-form-model-item的prop属性应该如何绑定，才能让两个字段都被form-model纳入。现状：只绑定其中一个，另一个是会被忽略的
<a-input
v-model="formData[item.field[0]]"

<a-select
slot="addonBefore"
v-model="formData[item.field[1]]"

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What is expected?

让两个字段都被form-model纳入，可以触发校验和重置等方法

What is actually happening?

只绑定其中一个，另一个是会被忽略的

[jinan5694]

文档里写了

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