from #29863 comment:15

CC: @tscrim @kwankyu @tobiasdiez

Component: cython

Author: Matthias Koeppe

Branch/Commit: u/mkoeppe/add_missing_cdef_method_declarations__for_cython_3_ @ 9d89bdf

Issue created by migration from https://trac.sagemath.org/ticket/34257