I think that just means "numpy hasn't yet been rebuilt for Python 3.8". (In Python modules that include a C extension, the .py files are shared but the C part is compiled separately for each Python version.)

As there are ~500 modules requiring such a rebuild (https://release.debian.org/transitions/html/python3.8.html), this may take some time. (numpy itself will probably be a source upload, to move 1.17 from experimental to unstable.)

For testing, it may be easiest to use an Ubuntu chroot for now.

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