getFieldsValue(true) allows for direct mutation of the form store

[AndreLemay]

Repro:

Set up any basic form, and give a field an onChange like this:

() => {
    const formData = form.getFieldsValue(true)
    delete formData.nameOfField
    console.log(form.getFieldsValue(true))
}

Normally, one would expect that this should have no effect, as react/state context should be immutable, but in this case you will find that it will log an object missing the deleting field.

The problem comes from the implementation of getFieldsValue here:

field-form/src/useForm.ts

Lines 271 to 273 in d789287

	if (nameList === true && !filterFunc) {
	return this.store;
	}

Which just returns the store object directly.

This should be following React conventions and returning a clone, as it does when a specific list of NamePaths is requested.