feat(xml-parser) Option for, do not unwrap single values. Keep arrays.

[Domvel]

fast-xml-parser parses the xml in an intelligent way. This is awesome. See these examples:

---

XML with multiple values:

<complies>
  <standard>STD1</standard>
  <standard>STD2</standard>
</complies>

in json:

{
    "complies": {
        "standard": [
            "STD1",
            "STD2"
        ]
    }
}

---

XML with single value:

<complies>
  <standard>STD1</standard>
</complies>

in json:

{
    "complies": {
        "standard": "STD1"
    }
}

---

My feature-request is to add an option to force keeping the array also for single values to normalize the whole xml. An option with the default value false to keep the current behavior as prefered behavior.

The new option could be named doNotUnwrapSingleValue or something like this. The export for single values in xml should result in this json:

{
    "complies": {
        "standard": ["STD1"]
    }
}

Why?
Because every node has the same structure.

Note:
This does not affect the root node. The root node never have multiple values. (tested in xml2js)

What do you think about my suggestion?

fast-xml-parser version: 3.12.20

[Domvel]

I close it, because it's not important at this moment. I like the current behavior. And it will come to late. I have to adapt it to the last xml-parsers behavior. (xml2js)
But feel free to re-open this issue if you want this feature.

[amitguptagwl]

I believe its a good idea. Need to cross validate it against previously raised requirements

#181 #135