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Multiple bumps are allowed between releases where necessary
Where possible, batch multiple changes that each would require a major bump together
Ensure that the compatibility ports / packages are updated as appropriate
Request an exp-run of ports to understand the full impact of the change to the base system
Any changes to major libraries must still allow build from source upgrades to succeed
Changing the ABI is allowed, otherwise FreeBSD cannot evolve. However, the project has generally chosen to pay the added cost of retaining ABI backward-compatibility.