New Features and Improvements in Elixir v1.18

Elixir v1.18.0 introduces a range of enhancements including enhanced type checking for function calls, the addition of a built-in JSON module, and several improvements to ExUnit for better testing capabilities. The release includes new features in various modules such as the ability to handle higher integer values in Process.sleep and support for parameterized tests in ExUnit. Additionally, it features improvements in the compiler, error handling in IEx, and new utilities in Mix that enhance development workflow. This update also includes bug fixes and soft/hard deprecations for obsolete functionalities. Overall, it aims to advance the language's capabilities while improving developer experience.