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You still get a downvote reason box, and you still need to click the submit button on it, so impossible to accidentally downvote using the steemit front end, I have no clue or idea if this change impacts the other front ends So since you use Partiko you may want to ask them or try it out on one of the steemit blogs, like the 2 day poll post.

Hahaha, it's better tried on @Steemitblog's blog