- You can type special characters with a backslash prefix, as shown by hovering over the character bar above. Documentation links for primitives are here.
- Any modifier with enter will execute, not just shift. The code window is vertically resizeable.
- Support for function headers and multiple bodies is missing.
- It's slow, but not that slow: usually most of the time is spent compiling your code, and sometimes from formatting the output. Chrome is faster than Firefox here, and speeds up over a few runs as JIT compilation kicks in.