- Update to version 8.19.0. The most impactful changes:
  * Sort polymorphism makes it possible to share common constructs
    over `Type`, `Prop` and `SProp`.
  * The notation `term%_scope` to set a scope only temporarily (in
    addition to `term%scope` for opening a scope applying to all
    subterms).
  * `lazy`, `simpl`, `cbn` and `cbv` and the associated `Eval` and
    `eval` reductions learned to do head reduction when given flag
    `head`.
  * New Ltac2 APIs, improved Ltac2 `exact` and dynamic building of
    Ltac2 term patterns.
  * New performance evaluation facilities: `Instructions` to count
    CPU instructions used by a command and Profiling system to
    produce trace files.
  * New command `Attributes` to assign attributes such as
    `deprecated` to a library file.
- Notable breaking changes:
  * `replace` with `by tac` does not automatically attempt to solve
    the generated equality subgoal using the hypotheses. Use `by
    first [assumption | symmetry;assumption | tac]` if you need the
    previous behaviour.
  * Removed old deprecated files from the standard library. 
- Use %fdupes in the documentation package.

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