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Arbitrary precision with power function

Hello! Sorry for my english. Why in Sage 5.6

numerical_approx((3**2.72), digits=200)

gives

19.850425152727527944307439611293375492095947265625000000000000000000000\ 000000000000000000000000000000000000000000000000000000000000000000000000\ 000000000000000000000000000000000000000000000000000000000

and

RealField(1000)(3**2.72)

gives

19.850425152727527944307439611293375492095947265625000000000000000000000\ 000000000000000000000000000000000000000000000000000000000000000000000000\ 000000000000000000000000000000000000000000000000000000000000000000000000\ 000000000000000000000000000000000000000000000000000000000000000000000000\ 0000000000000

? After digit 5 zero, zero, zero. How to get more digits in Sage?