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Critical 9.1
Shamir backup recovery accepts a share at x = 0, so a supplied share can substitute the recovered private key
`KeyShares::from_backup_format` (the Shamir backup share reader, public since 0.2.0, the crate's first release) accepted a share whose x coordinate is 0, and `KeyShares::recover_private_key` interpolates the shares at x = 0 to recover the key. At an x of 0 th…