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Re:Add Reactions to Pull Requests, Issues, and Comments by lccarrasco on Thursday March 10, 2016 @09:48PM (#11264321)
I believe the implied meaning is:

+0 -> support from the sidelines (like for a change that doesn't directly affect you)/something that's not urgent but would be nice

-0 -> disagree from the sidelines/disagree with the solution but can't think of a better one

Re:Add Reactions to Pull Requests, Issues, and Comments by alecdbrooks on Thursday March 10, 2016 @11:29PM (#11264651)
I would enjoy it if they used +ε and -ε for that, although +0 and -0 is probably clearer.
Re:Add Reactions to Pull Requests, Issues, and Comments by rtpg on Friday March 11, 2016 @12:48AM (#11264873)
like that idea! Dunno how many people have epsilon easily accessible on their keyboards though.