Actually tduong, .999 repeating is 1.000 (repeating 0's). It is the proper decimal representation for the real line. It is not two different values, it is two different representations. In the same sense, 1/3 = .333 repeating. There is no problem if X = 1/3 and X = .333, it is not two values, it is two representations of the same value.

I think that many mathematically minded people would disagree with your analogy.