Pasting negative numbers, or negative ngmodel...

Hello ppl, the ng-negative-number work only if you input the '-' char... but if you paste a negative number or change the ng-model to a negative value, it won´t work...

I am issuing this, because i need to change a money mask positive or negative acording to the dynamic calc of several fields... And thus can give me a ng-model positive or negative... but the field only gets the int and ignores the '-' from the model.
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