Github user srowen commented on the issue:
    Ah, do we need to update that? it looks like `threshold` is separate, and 
overrides `thresholds`. It's just used as a cutoff for the positive class, so 
it doesn't have same problem when it's 0. You could legitimately set it to 0 to 
always predict the positive class. 
    In the binary case, using this as a cutoff gives the same answer as this 
ratio-based rule anyway.
    (Really ... it _would_ make sense to allow _one_ threshold to be 0, which 
would effectively mean always predict the class, in the multiclass case. But 
let's leave that.)

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