ReadonlyindexThe x-coordinate: a safe non-negative integer number, or a bigint in
[0, 2^64 - 1] for values a number cannot hold exactly. Recovery
narrows it to its low eight bits, as the reference's as u8 does, so
256 names the same point as 0.
ReadonlydataThe y-bytes; every share of one split has the secret's length.
A share handed to recoverSecret: its x-coordinate and the y-bytes. Both are wire.