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Addends in relocations are signed integers as theoretically it could be a negative number. As Atom's offsets are relative to their parent section, the relocation value should still result in a postive number. For this reason, the final result is stored as an unsigned integer. Also, rather than using `null` for relocations that do not support addends. We set the value to 0 for those that do not support addends, and have to call `addendIsPresent` to determine if an addend exists or not. This means each Relocation costs 4 bytes less than before, saving memory while linking.