QML/Javascript: Using an anonymous function as a default parameter in a function signature crashes the application.

// this will crash program
function crashFunction(functionptr=function(){}){ }

// complete example with work arounds
import QtQuick 2.15
import QtQuick.Window 2.15

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Crash QML Default Function Parameter")

    // this crashes
    function crashFunction(functionptr=function(){}){ functionptr(); }

    // work around 1
    function emptyfunc(){}
    function nocrashFunction(functionptr=emptyfunc){ functionptr(); }

    // work around 2
    function nocrashFunction(functionptr=null){
        if(functionptr){
            functionptr();
        }
    }

    // work around 3
    property var crashFunction: function(functionptr=function(){}){ functionptr(); }
}