No it would be two possible complex numbers for square roots, three for cubic roots, and an infinite number of roots for non integer real powers, here you could expect millions possible values because your power is in fact a rational with many digits).
Even within complex numbers, such exponent is not defined if there's no additional parameter to select the rank of the argument.
So it's logical that it returns an NAN value (the sign given to the NAN is in fact fake, it just keeps the sign of the radicand, i.e. the 1st parameter of the power; the sign of the powerand does not play any role in the sign of any valid complex root that could be returned)
Powers are defined and are returning a single root only for positive radicands, without needing any additional parameter as its argument is null and remains null at any rational power.
