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* Add ``nested-in-python`` representation (3)
* Merge character classes in alternations (4)
* Remove unnecessary parentheses (5)
* Remove unnecessary ``+`` in nested-python output (7)
* Make compressions for nicer RFC 3339 (8)
* Use Tarjan's depth-first topological sort (10)
* Fix non-deterministic behavior due to sets (11)
* Replace repetition range with shorter alternatives (16)
* Test for RFC 8141 and fix transformations for it (20)