Sorting without default sorting is incorrect

[sakae-nakajima]

The table doesn't render records as given.

This is due to the following line:
https://github.com/mattiash/angular-tablesort/blob/master/js/angular-tablesort.js#L540

Print two arrays:
console.log(array);
console.log(arrayCopy);

You see different orders. The concat method changes the order based on $$hashKey allocated by angular.

This can be observed when you have a large set of records, than when you have a small set of records.

I ended up using track by {attr} to stop allocation of $$hashKey by angular.