P256K Foundation Data Extended Structure Data extension Data Topics Instance Properties var compactSizePrefix: DataThe data prefixed with a Bitcoin-style compact-size integer encoding the byte count. Instance Methods func copyToUnsafeMutableBytes<T>(of: inout T)Copies up to MemoryLayout<T>.size bytes from this Data into the raw memory of value, used to populate opaque C structs such as secp256k1_pubkey and secp256k1_musig_aggnonce.