Unpremultiply vs. Premultiplied Checkbox

Today, I decided to mess around with some new workflows and I stumbled upon this. I’m getting way different results when I use an Unpremultiply than if I check the Premultipled box on the read node. I was under the impression that these both did the same thing. When I premult them back into the comp, I’m getting different edging as well.

Can anyone explain this?

Using Nuke 5.1v5

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