Special Characters seem to break the control

[wolfpackt99]

It seems that special characters seem to break the control with a .toUpperCase()
It would be nice if the alphabet control would group all non [a-z] characters into one group.

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[ericferreira1992]

Hello @wolfpackt99. Could you provide an example of input data so that I can simulate the error?
Thanks the report.

[wolfpackt99]

x[this.propAlphaOrder].toUpperCase()

x[this.propAlphaOrder] was null. Certainly i can handle that, however, it would be nice of your was safe as well.

it be cool to have some options on how to group the special characters.