The new release includes some improvements in both Forward and
Reverse mode:
  * Better correctness of C++ constructs -- handle scopes properly; allow proper
  variable shadowing; and preserve namespaces.
  * Efficient evaluation in forward mode.
  * Reduced cloning complexity.
  * Handle more C++ constructs -- variable reassignments and for loops.

See more at: https://github.com/vgvassilev/clad/blob/v0.3/docs/ReleaseNotes.md