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Is There a Bug in the Light Client?
A bug means that even though the validators didn't sign off on some header, we say that we approve an inner circuit. What you can do in your light client is if for the same block number there are two block headers that both passed all these checks. That's a sort of assertion we can add inside our light client and we can change some flag from like... So you don't support forking them? What if there is actually a long fork that then reconciles itself in the six block finality period? There is some sort of... You are making some choice there that might be slightly different than the each stock fork choice rule. Although yeah, I'm sure it exists.