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If you find a bug, poor default, missing feature or find any part of the API inconvenient, please file an issue on Github. If possible, try to explain what behavior you expected and why. Bonus points for contributing failing test cases.
Validateur uses Leiningen 2. Make sure you have it installed and then run tests against supported Clojure versions using
lein2 all test
Then create a branch and make your changes on it. Once you are done with your changes and all tests pass, submit a pull request on Github.