`formState.isDirty` is true even though no field is really dirty

Describe the bug When setting values on a form for which there are no related fields for, the form stays dirty after reverting these values back to their original state.

To Reproduce Steps to reproduce the behavior:

1. Click on ‘Clear’ button
2. Click on ‘Revert’ button
3. Click on ‘Submit’ button
4. In the console i compare the defaultValues with the values the form submits. They are totally equal! formState.isDirty is true, formState.dirtyFields is an empty object.

Codesandbox link (Required) https://codesandbox.io/s/react-hook-form-useform-template-forked-q3iw3?file=/src/index.js

Expected behavior When the current values of the form equals the defaultValues, formState.isDirty must be false.

Desktop (please complete the following information):

• OS: macOS Mojave Version 10.14.6 (18G5033)
• Browser: Google Chrome Version 88.0.4324.96 (Official Build) (x86_64)

Additional context Besides the only form field called “nickname” in the example provided, there is an additional operations variable in the defaultValues object (which is not a field, only data) which also gets updated in the example by using setValue. The issue is related to that variable. If i remove the operations thingy, the example works fine without any issue.