[Bug]: XMLHttpRequest invalid UTF-16 response from lib://

[perkinslr]

Describe the Bug

The new XMLHttpRequest implementation improperly decodes lib:// responses as UTF-16, which produces gibberish output.

To Reproduce

In a frame5, execute this script, with any text data in the target URI

    const x = new XMLHttpRequest()
    x.open("GET", "lib://Test/macro/test.json")
    x.onreadystatechange = () => {
        console.log(x.readyState)
        if (x.readyState == 4) {
            console.log("XMLHTTPRequest Response:" + x.response)
        }
    }
    x.send()

Expected Behaviour

The content of test.json@lib:Test should be broadcast to the chat box.
Instead, a string of gibberish text is broadcast.
XMLHTTPRequest Response:笢景漢㨠㌲�

Screenshots

No response

MapTool Info

develop branch from github

Desktop

Gentoo Linux

Additional Context

No response

[Phergus]

Assumed to be working.