fix(core): fix value is overwritten by default (#917)

docs/zh-cn/schema-develop/faq.md

@@ -0,0 +1,51 @@
+```jsx
+import React from 'react'
+import ReactDOM from 'react-dom'
+import {
+  SchemaForm,
+  FormButtonGroup,
+  SchemaMarkupField as Field,
+  Submit,
+  FormPath,
+  createFormActions
+} from '@formily/next'
+import { Input, FormCard, setup } from '@formily/next-components'
+import '@alifd/next/dist/next.css'
+
+setup()
+
+const actions = createFormActions()
+
+const App = () => {
+  return (
+    <SchemaForm
+      initialValues={{
+        container: [{ bb: '123' }, { bb: '123' }]
+      }}
+      effects={($, { setFieldState }) => {
+        $('onFieldChange', 'container.*.bb').subscribe(
+          async ({ value, name }) => {
+            const siblingName = FormPath.transform(name, /\d+/, $d => {
+              return `container.${$d}.aa`
+            })
+            await setFieldState(siblingName, state => {
+              state.visible = value !== '123'
+            })
+          }
+        )
+      }}
+    >
+      <Field name="container" type="array">
+        <Field name="object" type="object">
+          <FormCard>
+            <Field name="aa" required type="string" />
+            <Field name="bb" required type="string" />
+          </FormCard>
+        </Field>
+      </Field>
+      <button type="submit">Submit</button>
+    </SchemaForm>
+  )
+}
+ReactDOM.render(<App />, document.getElementById('root'))
+```