Append/Prepend DeepPartial of value

[ymor]

Hi,
Loving the extra TS support! I was just wondering if it would be possible that append/prepend could take a deep partial instead of just partial? This would be super handy for nested field array scenarios, where you want to just create an empty nested iteration and not supply any default values.

Here's an example https://codesandbox.io/s/nested-array-v7-4fq90?file=/src/FieldArray.tsx See lines 46 and 56.

Thanks.