Code for the rename catch is confusing.

[Amxx]

This code is not really clear

    const nameChange =
      !this.unsafeAllowRenames &&
      original.label !== updated.renamedFrom &&
      (updated.label !== original.label ||
        (updated.renamedFrom !== undefined && updated.renamedFrom !== original.renamedFrom));

(updated.renamedFrom !== undefined && updated.renamedFrom !== original.renamedFrom) is "if we are renaming, and we are not renaming what original renames from".

[Amxx]

This is slower to run, but is IMO way clearer:

const nameChange =
    !this.unsafeAllowRenames &&
    (
        // the original label is neither the new label, not the renamedFrom
        ![ updated.label, updated.renamedFrom ].includes(original.label) ||
        // the renamedFrom is set, and doesn't match either the previous label, or the previous rename
        ![ undefined, original.label, original.renamedFrom ].includes(updated.renamedFrom)
    )

[frangio]

The suggested code looks good to me. Can you open a PR?