js issue – Array.prototype.shuffle() method cause error with `for (let x in a)`

Hi all

I found this issue.

If the plugin is enabled, this js code snippet has a strange behavior:
a = []; for (let x in a) {console.log(a[x]);}

Array a is empty but the for loop print an element “function shuffle()”

The prototype function is defined into jquery.gridrotator.js (line 57 – original file)
If I comment this line, the previous snippet has expected behavior: no item printed.

This behavior causes issue with other plugins.

https://stackoverflow.com/questions/948358/adding-custom-functions-into-array-prototype

Please, fix it so we can use your plugin!

Thanks