qmlformat breaks with Javascript array destructuring

given this qml file:

import QtQuick
import QtQuick.Layouts
import QtQuick.Controls
Rectangle {
    function returnPair()

{         return [1,2];     }

    function acceptPairDestructured()

{         const [a,b] = returnPair();     }

}

 

when using the windows v6.5.0 version of qmlformat.exe with the -i and -V options, I get the following (Note the extra '[' character after the "[a,b]"

Dumping Test.qml
Writing to file Test.qml
qt.qmldom.writeOut: writeOut of C:/tmp/Test.qml created invalid code:
----------
import QtQuick
import QtQuick.Layouts
import QtQuick.Controls

Rectangle {
    function returnPair()

{         return [1, 2];     }

    function acceptPairDestructured()

{         const [a, b][ = returnPair();     }

}

----------
  C:/tmp/Test.qml:11:21: [Dom][QmlFile][Parsing] Error: Unexpected token `[' for .currentItem

qt.qmldom.writeOut: failure reformatting  "Test.qml"
"Error while writing"