Hey Plotly, I'm trying to animate a zoom into a bar chart (see http://codepen.io/hellochar/pen/ozEBXr), but it looks like the bar charts disappear when they're being animated? Is that something intentional or something I'm doing wrong?

Also orthogonally, it looks like many of the different layout properties aren't animated smoothly - for instance, margin, width, height, bargap, xaxis.domain - is this expected?

Thanks for your time,
Xiaohan