message: Documenting that size() of a decrypting stream (in C++) is not guaranteed to be correct.
diff: @@ -66,6 +66,10 @@ class StreamingAead {
  // via the wrapper leads to AEAD-decryption of the underlying ciphertext,
  // using 'associated_data' as associated authenticated data, and the
  // read bytes are bytes of the resulting plaintext.
  + // Note that the returned wrapper's size()-method reports size that is
  + // not checked for integrity. For example, if the ciphertext file has been
  + // truncated then size() will return a wrong result. Reading the last block
  + // of the plaintext will verify whether size() is correct.
  // Reading through the wrapper is thread safe.
  virtual crypto::tink::util::StatusOr<
  std::unique_ptr<crypto::tink::RandomAccessStream>>
  