bug in replace array in json

hi, thanks for this great library.
when I'm getting different between this two jsons

```
"{\"b\": [1,2,4,9]}"
```

and

```
"{\"b\": [6,2,4,9]}"
```

the difference value currectly return operation replace in location 0.

but if I get diff this two jsons

```
"{\"b\": [2,2,5,6]}"
```

and

```
"{\"b\": [4,2,5,6]}"
```

it returns add and remove operation in 0 and 2 positions.
I think the reason of this bug is because of two number 2 .

Reproduce both JSON array examples from the issue and inspect the library's array-diff logic to see how duplicate values affect operation matching. Done means the second example reports the changed value at index 0 as a replace operation, without unrelated add and remove operations at indices 0 and 2.

Written by the indexing model from the issue text.