https://codesandbox.io/s/gifted-cori-qlhid5?file=/src/App.vue:0-2616

If i copy object with help function mergeDeep, object change if it is nested object

    var obj = {
        charSpacing: {
            test:{
                test:2,
            },   
            fromCharSpacing: 1,
        },
    }

obj.charSpacing.fromCharSpacing - dont change

obj.charSpacing.test.test - change!

If I print the values of the object before and after to the console, I see that test.test has become a proxy