Pull requests are welcome.
Please use "phpfmt" to ensure consistent formatting.
Before you do a PR, you should ensure any new functionality has test cases and that all existing tests are succeeding.
Since this project is a single file application, you must ensure that classes are loaded in the correct order. This is only important for the "extends" and "implements" relations. The build script appends the classes in alphabetical order (directories first). The path of the class that is extended or implemented must be alphabetically first. The build will fail with a "Class not found" error message if you get this wrong.