Yep. RPython is not a language as designed, it's an arbitrary set of restrictions to the Python bytecode and standard library. These restrictions change as deve

Yep. RPython is not a language as designed, it's an arbitrary set of restrictions to the Python bytecode and standard library. These restrictions change as developers implement new features and as time goes on. For instance, one restriction I had when I was working with PyPy was "str.strip can only take one character", but this has been removed in subsequence PyPy versions.