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kotlinlang

Hi.
I'm sorry if I didn't find a meaningful answer through the search.
The challenge is to JSON serialize differences between two object instances for HTTP PATCH requests.
Let *old* be
```{field1 : old, field2 : same, obj : {field1 : old, field2 : same}}```
Let *new* be
```{field1 : new, field2 : same, obj : {field1 : new, field2 : same}}```
Then *new - old* or *new.diff(old)* should be
```{field1 : new, obj : {field1 : new}}```
I would appreciate a recommendation on the idiomatic implementation for this.
P.S. <https://kotlinlang.slack.com/archives/C7A1U5PTM/p1638526272220500|This> thread looks similar but it's 2 years old and without a conclusion. The only other vaguely relevant discussion on StackOverflow for Java is <https://stackoverflow.com/questions/50967015/how-to-compare-json-documents-and-return-the-differences-with-jackson-or-gson|this one>.