incorrect SOA serial representation in: catz: updating catalog zone 'catalog.invalid' with serial -1624016872

Summary

CATZ prints serial number as signed instead of unsigned number. This breaks serials > 2^31.

BIND version used

• Affects v9.18: v9_18_10
• I did not check older versions. Please check if backport is necessary.

Steps to reproduce

Use catalog with serial > 2^31, e.g. 2670950424.

What is the current bug behavior?

Log:

catz: updating catalog zone 'catalog.invalid' with serial -1624016872

What is the expected correct behavior?

Serial 2670950424.

Relevant configuration files

options {
     catalog-zones {
          zone "catalog.invalid." min-update-interval 1 default-primaries { 2600::; };
     };
};

zone "catalog.invalid." {
        primaries { 2600::; };
        type secondary;
};