Problem with imaginary numbers

[Dreamlax]

I think this is probably me not thinking, but:

If Sqrt( x ^ 4 ) = x ^ (4 * 0.5) = x ^ 2   'then shouldn't
 
Sqrt ( i ^ 4 ) = -1 ?  'since it would be
 
i ^ (4 * 0.5) = i ^ 2 = -1?

Mathematica returns 1 and I don't exactly want to doubt that.