getter for chart specification?

[rgdonohue]

I'm using v0.9.2 and trying to implement this example using error bars (hacking it a bit to show lower and upper confidence intervals): http://cedar-v0.surge.sh/examples/errorbars.html

I have a rendered chart, though when I attempt to access the specification it doesn't seem to be available in the object. The specification object appears to be under a chart._definition object instead, console.log(chart):

And when I attempt to access it via chart._definition.specification it turns up undefined.