Sodium::Cipher::Aead::Xchacha20Poly1305Ietf
  New recommended AEAD algorithm.
Sodium::Password
  Create keys based on a time cost.
  Hashing and Key derivation split in to separate classes.
Sodium::*::PublicKey
  JSON and Yaml converters.
Sodium::Cipher::Chalsa
  Add #random_bytes for use as a CSPRNG.
Sodium::Nonce
  Reuse detection.
Sodium::SecureBuffer
  State transitions with exceptions instead of crashes.
Sodium::Kdf
  Use SecureBuffer to keep key unreadable until used.

SecureBuffer uniformly used in most key holding classes with erase param.

More documentation.
More benchmarks.
More specs.