The methods .rational_maps() and .x_rational_map() for WeierstrassIsomorphism return polynomials, but the same methods for other EllipticCurveHom return rational maps (i.e., elements of the fraction field).

For consistency, these methods should return the same types in all child classes of EllipticCurveHom, despite the rational maps actually having denominator 1 in this case.

Component: elliptic curves

Author: Lorenz Panny

Branch/Commit: 551d007

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/34811