> The three nulls in the load segment (between the code and data) are included in [..]

Yes, this is a bug. Thanks for reporting it to the issue tracker.

> Also, I wish the arrow heads did not opaquely overlap the numbers. Adding opacity="0.3" to the svg tag fixes this for me.

Will put to toggle-able options. The arrows really hinder comprehension, perhaps arrowheads could be made smaller too.