tcdejong

Some datasets like `ffox` are images (.png) and thus throw a `ValueError` To reproduce in `vega-datasets-0.9.0` (current version on pip): ```py from vega_datasets import data data.ffox() ``` Raises: ```py ---------------------------------------------------------------------------...

I'd love a setting / checkbox to render a the tile grid over all plain/swamp tiles. It could just be a dark gray raster laid above plains/swamp, but just below...