EW>> Yes, but AFAIK not all numbers with the high bit set are
EW>> negative numbers. 1's would be '-0', just as all 0's would be
EW>> '+0'.
 >     All ones is -1  (0xff...)
 >     All zeros is 0  (0x00...)
 >     In discrete math, is zero positive/negative or neither?
neither.
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