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In a previous commit, we changed the serial number representation from a
string to an integer. This made it easier to compare serial numbers,
but also introduced new problems:
- Serial numbers should be formatted consistently, for example as
"{:#010x}". It is hard to ensure this for an integer value.
- The format of the serial number may be subject to change. Users
should not rely too much on the u32 representation.
Therefore we introduce a new SerialNumber struct that represents a
serial number. Currently it only stores a u32 value. The following
traits and functions can be used to access its value:
- FromStr for string parsing
- ToString/Display for string formatting
- as_u32 to access the underlying integer value
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