ANNOUNCEMENT FOR INTEXGRAL v4.0.0
                             (2026-06-06)

Changes
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Added
- Detailed implementation.
- Keys `varsep`, `diffsep`, `postsymbsep` and `diff-order`.
- Variable keyword `cylindrical*`.

Changed
- The `derivative` is no longer a dependency. The differentials are now managed internally.
- Key `symbolskip`, renamed in `innersymbsep`.
- Key `hide-diff`, renamed in `novar`.

Removed
- Keys `diff-star` and `diff-options`.