If I am correctly interpreting the sentence "Each formatted number is in a box" 
from [1], then following phrase should not produce a
box:

           8!:0 i. 0
        ++
        ||
        ++

That is, there are no formatted numbers, so there should be no boxes.  Put 
another way, the following is inconsistent:

           # 8!:0 i. 3
        3
           # 8!:0 i. 2
        2
           # 8!:0 i. 1
        1
           # 8!:0 i. 0
        1
           
Put another way, since 8!:0 deals with "each number", I expect it to act as if 
it were rank 0, even if has unbounded rank.

-Dan

[1]  Specification of  8!: :  
http://www.jsoftware.com/help/dictionary/dx008.htm 

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