Huh, I didn't know that. https://github.com/BLAKE3-team/BLAKE3/blob/b404c851c284ed01f51a4606e1e13f51a89c2584/reference_impl/reference_impl.rs#L279 https://gith

Huh, I didn't know that. https://github.com/BLAKE3-team/BLAKE3/blob/b404c851c284ed01f51a4606e1e13f51a89c2584/reference_impl/reference_impl.rs#L279 https://github.com/BLAKE3-team/BLAKE3/blob/b404c851c284ed01f... I peeked at the reference impl (380 lines of safe Rust) and found this. It has a 1,728-byte array for tree state, which is enough for 2 ^ 64 bytes. So in practice it's also fixed.