> Common API for getting and setting accessor functions. This is a really good idea, and it solves the issue of coupling commonly see in d3.js examples, where

> Common API for getting and setting accessor functions. This is a really good idea, and it solves the issue of coupling commonly see in d3.js examples, where the chart needs to know about the keys (properties) of the data. I usually write accessor functions as part of my model to avoid this coupling but letting the chart component take in accessor is clearly a better approach.