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We changed to use variable length encodings for many types by default, including Word32. This makes sense for numbers but not when Word32 is meant to represent four bytes. I added a FixedLengthEncoding newtype to Binary who's instances interpret their argument as a collection of bytes instead of a number. We then use this when writing/reading magic numbers to the iface file. I also took the libery to remove the dummy iface field. This fixes #18180.
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