ng-change function's newValue/oldValue don't respect true-value/false-value attributes

[kanesee]

Create a switcher with true-value, false-value, and ng-change

e.g.

      <switcher ng-model="switchertype"
                ng-change="onSwitcherChange(newValue, oldValue)"
                true-label="Public"
                true-value="'public'"
                false-label="Private"
                false-value="'private'"
                ></switcher>

Clicking on the toggle itself, sets the newValue and oldValue to "public" or "private", as expected.
But clicking on the labels, the newValue and oldValue become either true or false.