Flowdock
**(p1) public

Performs exponentiation.

Rational(2)    ** Rational(3)     #=> (8/1)
Rational(10)   ** -2              #=> (1/100)
Rational(10)   ** -2.0            #=> 0.01
Rational(-4)   ** Rational(1, 2)  #=> (0.0+2.0i)
Rational(1, 2) ** 0               #=> (1/1)
Rational(1, 2) ** 0.0             #=> 1.0
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