On 10/13/2015 10:55 AM, Elle Stone wrote:
So does this seem like a bug in the Addition blend mode? Or is there
something I'm not still not understanding about how Addition layer blend
mode is supposed to work?

Hmm, Krita produces the results I expected, that is, the three layers add up to R=G=B=1.0f.

So either GIMP intentionally uses a different algorithm for addition blend mode. Or else there's a bug in the code, most likely the same bug reported here: https://bugzilla.gnome.org/show_bug.cgi?id=744265. I'll add a comment to that bug report.
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