Diff data stripped - compare objects and show only the inner bits that differ

diffdata.js

function diffdatastripped(legacy,shiny) {
    let delta={},allgood=true;
    for (const key in legacy){
        const oldval = legacy[key];
        const newval = shiny[key];
        if (typeof(oldval)==='object' && typeof(newval)==='object'){
            delta[key] = diffdatastripped(oldval,newval)
            if (delta[key] !="✅") {
                allgood=false;
            }
        } else if (oldval==newval){
            delta[key]="✅";
        } else if(Math.abs((oldval-newval)/oldval)<0.005){
            delta[key]="≅";
        } else {
            delta[key]="❌ expected: "+oldval+" got: "+newval;
            allgood=false;
        }        
    }
    if (allgood){
        return "✅";
    }  else {
        return delta;
    }
}