Pickling frobenius endomorphism is broken #34654
Description
sage: K = Frac(GF(5)['T'])
sage: phi = K.frobenius_endomorphism()
sage: phi
Frobenius endomorphism x |--> x^5 of Fraction Field of Univariate Polynomial Ring in T over Finite Field of size 5
sage: loads(dumps(phi))
Identity endomorphism of Fraction Field of Univariate Polynomial Ring in T over Finite Field of size 5
CC: @kryzar
Component: pickling
Keywords: frobenius
Author: Xavier Caruso
Branch/Commit: a9a4183
Reviewer: Sébastien Labbé, Kwankyu Lee
Issue created by migration from https://trac.sagemath.org/ticket/34654