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This section describes how to pack and unpack arrays of bytes,
usually for binary network protocols. These functions convert byte arrays
to alists, and vice versa. The byte array can be represented as a
unibyte string or as a vector of integers, while the alist associates
symbols either with fixed-size objects or with recursive sub-alists.
To use the functions referred to in this section, load the
Conversion from byte arrays to nested alists is also known as deserializing or unpacking, while going in the opposite direction is also known as serializing or packing.