Addition of an attributes array

With the discussion to remove a lot of default styling from core and putting the class names and other attributes in the hands of the themers/designers. I am thinking an official attributes array is in order for theme functions.

This would be an array for all theme functions that contains all the attributes that are intended to be added to a block element. The structure would be something that drupal_attributes() could process for the final output. The idea is that module developers would be able to add classes for unobtrusive javascript, blocks would be able to add classes in the admin area, and the end theme would be able to sort through these attributes fairly easily.

Ideally this would be accessible via preprocess and module developers would use it only as needed for functionality purposes. I imagine it formatted something like this:

I realize that the drupal_attributes() function would have to be modified to handle class as an array, but I feel this is easier to deal with than a single string.

Now, this is a raw thought and I am sure that this needs work before it can be considered as a final proposal. I am hoping this leads to a good way to allow module writers to give classes to elements and still allows us to maintain control. I also feel it is a good start towards letting admin configurable classes for blocks that has been mentioned before.