In preparation of
https://github.com/solana-labs/solana/pull/25237
which adds a new shred variant with merkle tree branches, the commit
embeds versioning into shred binary by encoding a new ShredVariant type
at byte 65 of payload replacing previously ShredType at this offset.
enum ShredVariant {
LegacyCode, // 0b0101_1010
LegacyData, // 0b0101_1010
}
* 0b0101_1010 indicates a legacy coding shred, which is also equal to
ShredType::Code for backward compatibility.
* 0b1010_0101 indicates a legacy data shred, which is also equal to
ShredType::Data for backward compatibility.
Following commits will add merkle variants to this type:
enum ShredVariant {
LegacyCode, // 0b0101_1010
LegacyData, // 0b1010_0101
MerkleCode(/*proof_size:*/ u8), // 0b0100_????
MerkleData(/*proof_size:*/ u8), // 0b1000_????
}
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