fails:Rational#** when passed Bignum returns positive Infinity when self is > 1
fails:Rational#** when passed Bignum returns 0.0 when self is > 1 and the exponent is negative
fails:Rational#** when passed Bignum returns positive Infinity when self < -1
fails:Rational#** when passed Bignum returns 0.0 when self is < -1 and the exponent is negative
