OK, something very odd was just brought to my attention. I did a quick search in this thread and couldn't find anyone mentioning it. Has anyone noticed or heard about this before?
Someone made a post asking if CA/Inc stack. Someone said no, I knew that they do, but wanted to provide proof, so I made this post:
Incarnation + Celestial Alignment - Forums - World of Warcraft
Someone pointed out a weirdness with CA/Inc damage, where it appears that the mastery bonus was double dipping. I thought that very weird so I hit both CDs at once, tested some more and couldn't repeat my results. Well, anyway, let me just copy/paste:
Very weird. I'm not seeing the double dipping effect anymore. I moved to darnassus target dummies so that other peoples' debuffs wouldn't affect my tests, but that's all I changed.
No buffs, just moonkin form, level 80 target dummy, no will of unbinding, no weapon
6947 SP
1617 mastery (total of 46.95% damage increase)
Eclipsed

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Your Starfire hit Training Dummy 1 Arcane. (26333 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26563 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26988 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26315 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25966 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25950 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25713 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26521 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26357 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26613 Overkill)
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Uneclipsed

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Your Starfire hit Training Dummy 1 Arcane. (18374 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (18165 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (17628 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (17592 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (18373 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (17938 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (17934 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (18182 Overkill)
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CA

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Your Starfire hit Training Dummy 1 Arcane. (26839 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26122 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25697 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25588 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25582 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (26410 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25890 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (25928 Overkill)
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Incarnation (eclipsed)

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Your Starfire hit Training Dummy 1 Arcane. (31961 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (33032 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32203 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32817 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (33393 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (33141 Overkill)
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CA + Incarnation

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Your Starfire hit Training Dummy 1 Arcane. (32039 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32413 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32384 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32979 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32251 Overkill)
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OK, this is definitely weird. The tests above were very contrived, in that I used AC to move my eclipse bar around, and I just used CA/inc at the same time instead of the way we do it rotationally.
But just now I went ahead and set things up the way we do at the start of our rotation. So, 75 pre-lunar, hit wrath, Inc, starfire spam til end of lunar, CA, more starfire spam. I didn't cast any other spell, just starfire. Here's the complete combat log for that:

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Your Eclipse (Lunar) applied You.
Your Nature's Grace applied You.
Your Incarnation: Chosen of Elune applied You.
Your Wrath hit Training Dummy 1 Nature. (21926 Overkill) (Critical)
Your Velocity applied You.
Your Starfire hit Training Dummy 1 Arcane. (33583 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (33764 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32609 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (32950 Overkill)
Your Eclipse (Lunar) faded You.
Your Starfire hit Training Dummy 1 Arcane. (53871 Overkill) (Critical)
Your Celestial Alignment applied You.
Your Starfire hit Training Dummy 1 Arcane. (47620 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (47510 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (48596 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (98256 Overkill) (Critical)
Your Starfire hit Training Dummy 1 Arcane. (47501 Overkill)
Your Velocity faded You.
Your Starfire hit Training Dummy 1 Arcane. (49054 Overkill)
Your Starfire hit Training Dummy 1 Arcane. (99849 Overkill) (Critical)
Your Starfire hit Training Dummy 1 Arcane. (48587 Overkill)
Your Nature's Grace faded You.
Your Celestial Alignment faded You.
Your Starfire hit Training Dummy 1 Arcane. (17433 Overkill)
Your Incarnation: Chosen of Elune faded You.
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When I cast CA on the tail end of lunar, it appears to be double dipping on mastery again, even though it didn't earlier when I just cast CA at a random spot on the eclipse bar.
I don't know what to make of this.