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/usr/share/doc/libmagic-mgc/README.Debian is in libmagic-mgc 1:5.32-2.

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Between architectures, the compiled magic at /usr/lib/file/magic.mgc
differs only in the endianness. The libmagic library can auto-detect
wrong endianness and handle that situation gracefully, at a significant
performance cost though.

Therefore: If you run file/libmagic in a mixed-endianness multi-arch
setup, choose the architecture for libmagic-mgc wisely.