Introduce isObject option for unpaired tags

[c100k]

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• Have you included sample input, output, error, and expected output?
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Description

Unpaired tags are parsed into an empty string. But in some cases, it should be something else. Like an object for example.

In the same style of isArray, we could introduce an isObject option, working the same way.

Input

Let's take for example the following XML:

<Response>
    <id>123</id>
    <dataSet/>
</Response>

Code

https://naturalintelligence.github.io/fast-xml-parser/

Output

It gives the following output:

{
    "?xml": "",
    "Response": {
        "id": 123,
        "dataSet": ""
    }
}

expected data

I would instead expect the following result:

{
    "?xml": "",
    "Response": {
        "id": 123,
        "dataSet": {}
    }
}

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[amitguptagwl]

I've took care of this in v5.