Why is loop iterator signed and not unsigned?

Why is the data type of loop iterator a signed integer rather than an unsigned integer?  

I32 is much more universal, and is for example used for array indices, array sizes, etc. The iteration terminal is most often connected to one of those functions. Your diagram would have the measles, with coercion dots all over without I32 on the iterator.
If you need to keep count with e.g. U32 or U64, you can make your own using a shift register and +1 function.
(There are ideas to make the representation changeable according to your needs. See also my comment here)
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