on-checked-changed called on page render

[JonathanSidego]

Description

<paper-toggle-button on-checked-changed="handleToggleChange" id="toggle"></paper-toggle-button>

I have the above code, and on rendering the page for the first time, the handleToggleChange handler gets called, even though the checked state of the toggle isn't being manipulated.

Is this somehow expected behaviour?

Expected outcome

That it only gets called when the toggle is clicked/dragged.