salt property
The Argon2id salt.
When null, Argon2idHashingAlgo falls back to using the password's own UTF-16 code units as the salt. That fallback exists solely to keep key files written before this field was added readable — it makes derivation deterministic, so the same passphrase always yields the same key and one precomputation table serves every user who chose it. Always supply a unique random salt for new material.
Implementation
List<int>? salt;