It is a known issue with Python 3.8.3rc1. See https://bugs.python.org/issue39562 for details.
- Bug#960201: python-gmpy2: autopkgtest regression: RuntimeW... Paul Gevers
- Bug#960201: python-gmpy2: autopkgtest regression: Run... Martin Kelly
- Bug#960201: python-gmpy2: autopkgtest regression:... Paul Gevers
- Bug#960201: python-gmpy2: autopkgtest regress... Case Van Horsen
- Bug#960201: Update Case Van Horsen
