A new version of Golf is coming soon, bringing many new features, better performance and stability.
The improvements will include stack depth control (for recursion for instance), better support for file uploading, default values for input parameters, many new string statements and expressions, new formats of output, new number expression (such as binary), better usage of hashes and arrays, much better error handling/message and run-time stack trace (using libbacktrace directly), many new optimizations such as new fast memory system, prefetching and other significant performance improvements. Also, quite a few bugs have been fixed as well.
Stay tuned for details.