Classification of 0 (zero)

[#1]

If/When you work on updating the classification tool, can you include the ability to classify the number 0?

[#2]

Upvoted this as it's a problem I ran across for the first time today:  I tried to classify something as the value "0" (i.e. the number zero), and, when I downloaded the Classification file to check the upload, that field was blank.