showLeafAraryIndexes: false doesn't work as expected

It seems this option removes all array indexes, not only in leaf nodes.  For example:
`serialize({ array: [1, 2], nested: [{ key: 1 }, { key: 2 }]}, { showLeafArrayIndexes: false })`

Generates:

```
array[]: 1
array[]: 2
nested[][key]: 1
nested[][key]: 2
```

But I would have expected:

```
array[]: 1
array[]: 2
nested[0][key]: 1
nested[1][key]: 2
```