What is ⌊x.999...⌋?

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What is the Greatest Integer(Floor) Function of $x.\bar{9}$?

$x.\bar{9} = x + 1 \implies \lfloor x.\bar{9} \rfloor = x + 1$

But by observation, $\lfloor x.\bar{9} \rfloor = x$

So, which one is correct?