Integral Fail

[robmio]

Here comes the problem that always puts me in difficulty. If I set CAS without "use i to factor polynomials" I get:

sqrt((x-1)^2) -> abs(x-1)

and the integral

int(abs(x-1)^(8/3),x)

takes the form proposed by Albert Chan. However, if I set CAS with "use i to factor polynomials", the result takes the form of "robmio" and, for negative "x" values, the result of the integral gives a complex number.
So what is the correct result?