It is equalt to one. It has been proven in many ways it is not debated.
Here is a simple easy to follow mathematical proof:
1/9 = 0.111…
( 9 x 1/9) = (9 x 0.111…)
1 = 0.999…
None of the above statments are up for debate.
The problem people have with grasping the above is that infinity is hard for the mind to grasp. Many suppose the difference between 0.999… and 1.0 is a difference of
0.000…(infinite 0’s)…1. In other words it is viewed as a really long chain of zeros with a tiny 1 way out there. However in reality this is not the case. there is no end to the 0’s, as soon as you imagine that 1 at the “end” of your long string of 0’s, get rid of it and replace it with yet another 0. Do this forever until you are convinced that in fact there is no 1 out there and the difference between 0.999… and 1 is exactly 0. in aother words they are equal.