I suggest adding the Github defaults 
, 
, 
first. They are much more useful, familiar, and proven for showing progress, achievement, and attention.
If you use 
for “voting” “abstain” / neutral, then 
and 
should be added together. They are less emotional and discouraging than thumbs up & down. For reference, Paradox forums for games use 
and 
for agree and “respectfully” disagree.
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