I have a routine that will better flatten Muls containing Rational
powers:

    >>> a
    (x*(x*y)**(1/2))**(1/2)
    >>> a.base*a
    x*(x*y)**(1/2)*(x*(x*y)**(1/2))**(1/2)
    >>> powsimp(_)
    (x*(x*y)**(1/2))**(3/2)

Should this happen for all powsimp options or only if base combination
is desired?

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