d3 partition: ability to choose different "value" size variable

[aaron-613]

I have a Sunburst where each node has multiple values associated with it (e.g. packets, bytes, leaves). The goal is to be able to tween between different sized arcs for the different types of data. Using custom functions and hierarchy.eachAfter() I can build summed versions of each of these values for the whole tree, and can then sort the hierarchy by whichever I want. But when running partition it requires Node.value to be populated. This means having an extra variable on each Node. Rather, it would be nice if I could somehow say: use d.data.bytesCount varable instead.

I guess, the ability to pass a custom function to a new value() method for partition, where the default is to return d.value but can be modified if required.

Thank you for your consideration!