Change the mathutils callback from vector to color for mistColor, backgroundColor and ambientColor.
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Please include a sample blend file that demonstrates the new functionality, including setting a new color object (like world.backgroundColor = some_color) and showing whether setting a single component works (like world.backgroundColor.r = 0.34). This is needed for the release log anyway, makes it much easier for us to test, and serves as future documentation.
What do you mean with "release log"? Did you mean the "release note" http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.75?
As I know we only need a sample blend file for new features. But this is only a little API change.
Also I think for a missing test file you don't need make a patch stopping "request changes". A simple comment should be enough.
Anyway here is my test file.
Yup, that.
As I know we only need a sample blend file for new features. But this is only a little API change.
True that. It was only partially because of the release notes that I asked for it. In my experience an example file helps a lot when testing changes, as it shows more about the ideas of the programmer when (s)he made the changes.
Thanks for the test file, it's really extensive :)