Remove the deletion of a property in `setIn` with undefined value #3474

[fenyagg]

Remove the deletion of a property in setIn with undefined value. I don't see any reason to delete the property. This can cause problems #3474 .

closes #3474

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[iamn1ck]

Would love to see an update on this bug. Its been a known issue for 2 years now https://github.com/jaredpalmer/formik/issues/2332

[avasuro]

It will not work just to delete this lines, because setIn function is used to change formik.errors and formik.touched states (beside formik.values state), and it is required to actually remove undefined values from this states (e.g. see this bug for more info)

Need to somehow distinguish when undefined values should be removed, and when should not.

[fenyagg]

I see. I can add optional parameter to the setIn function like shouldRemoveUndefined.

[fenyagg]

I am deleting pr because it is not complete