@mistercrunch I see a lot of our users wanting adhoc transforms on the geo 
data. I wanted it here to allow us to do custom encoding/decoding just incase 
they want to do more things. I get that the backend has some but its not a 
catch all in my opinion. We can continue to iterate and move more of the 
functionality into the controls when we see fit which is what we've been doing.

@kristw We've been mostly using it for deckgl animations and gradients based 
upon the rows metadata. Here's an example deck.gl has for setting the color 
based upon density 
http://deck.gl/#/documentation/deckgl-api-reference/layers/polygon-layer. I 
also thing adding `d3-scale-chromatic` would dope too

@williaster backward compatibility +1 with what @mistercrunch mentioned.


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