Interesting observation, Martin.

Upon further consideration, the call signature for sorted really is quite odd.  It doesn't behave like any other builtin function.  Currently, "iterable" is positional-only, and "key=" and "reverse=" are keyword only.  I would only expect such behavior for functions with variadic *args.

I uploaded a new patch so that the call signature matches the original __text_signature__.  This means "iterable" may be given as a keyword argument, and "key" and "reverse" may be given as positional arguments.

I added tests for the new behavior, and all tests pass for me.