form.getFieldValue method will create a new field in fieldMeta

[lulut]

form.getFieldValue method will create a new field in fieldMeta. This cause an issue when set an array value to the field later.

version 2.2.x
getFieldMeta(name) { this.fieldsMeta[name] = this.fieldsMeta[name] || {}; return this.fieldsMeta[name]; }

version 1.4.x
getValueFromFieldsInternal(name, fields) { const field = fields[name]; if (field && 'value' in field) { return field.value; } const fieldMeta = this.fieldsMeta[name]; return fieldMeta && fieldMeta.initialValue; }

[lulut]

https://codesandbox.io/s/50x3l7y59n

Steps to reproduce

1. click "Add field" button
2. new row will be created with no issue
3. click "Error Button" button, no impacts to the function since the "list" variable has been initialized as an Array correctly.
4. reload the page
5. this time click "Error Button" first.
6. a new field "list" will be added to fieldMeta
7. click "Add field" button
8. error occurred because list is an 'object' instead of 'Array'

[Woodz]

This bug stumped me for two days. I definitely did not expect a method named "getFieldValue" to create a new field!!!