Limitations without Pandas/NumPy dependencies?

[AdolfVonKleist]

This seems like a great alternative interaction model for Vega/D3.js.
At the end of the Readme, there is a PSA stating that certain functionality in Vincent can be used without Pandas/NumPy. I wonder if you could elaborate on the limitations?

[wrobstory]

You can probably use most of the basic component-building API with Pandas/Numpy, but all of the chart-building and data-binding pieces require it. We've tried to catch import errors where possible so that it can be somewhat useful, but unfortunately we've done a lot of building around getting data into your charts via Pandas.