pointerdown firing twice

[charlie_says]

 

I noticed a minor bug in the project I'm working on, and the cause of it appears to be that

btn.interactive = true;
btn.buttonMode = true;
btn.interactiveChildren = false;
btn.on('pointerdown', this._click);

appears to call this._click on the down AND up event.

Is this expected behaviour?

</edit> I've edited this post as I realised that the issue I was having was partly a 'logical hangover' from the original.