freeze-bug-node-0.10.js

var strs = ['zz','ee','DD','dd','PP'];

function sortFirstLetter (a,b){
    a = a.toLowerCase().charCodeAt(0);
    b = b.toLowerCase().charCodeAt(0);

    if (a === b) {return 0;}
    else if (a > b) {return 1;}
    else {return -1;}
    
}


var times = 10;
while (times){
    strs.sort(sortFirstLetter);
    console.log(strs)
    times--;
}
console.log(' -- reset counter, freeze then try to sort again');
times = 10;
Object.freeze(strs);
while (times){
    strs.sort(sortFirstLetter);
    console.log(strs)
    times--;
}