AttributeError: 'NativeFunction' object has no attribute '__name__'

[SuperMaZingCoder]

I've run into an error trying to enter the Gurklang REPL.

Steps to reproduce:

1. Install following download instructions.
2. Enter REPL with env/bin/python -m gurklang

Trace:

❯ python3 -m gurklang
Traceback (most recent call last):
  File "/Users/super/.pyenv/versions/3.9.0/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/Users/super/.pyenv/versions/3.9.0/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/Users/super/Downloads/py-gurklang-master/gurklang/__main__.py", line 2, in <module>
    from . import repl, vm, parser
  File "/Users/super/Downloads/py-gurklang-master/gurklang/repl.py", line 8, in <module>
    from . import vm
  File "/Users/super/Downloads/py-gurklang-master/gurklang/vm.py", line 5, in <module>
    from . import prelude
  File "/Users/super/Downloads/py-gurklang-master/gurklang/prelude.py", line 7, in <module>
    from . import stdlib_modules
  File "/Users/super/Downloads/py-gurklang-master/gurklang/stdlib_modules/__init__.py", line 7, in <module>
    from . import math, inspect, coro, repl_utils, boxes, threading_, strings, recursion, ds_pure, ds, streams
  File "/Users/super/Downloads/py-gurklang-master/gurklang/stdlib_modules/strings.py", line 50, in <module>
    _register_delegated_methods()
  File "/Users/super/Downloads/py-gurklang-master/gurklang/stdlib_modules/strings.py", line 47, in _register_delegated_methods
    module.register_simple(name)(fun)
  File "/Users/super/Downloads/py-gurklang-master/gurklang/builtin_utils.py", line 42, in inner
    native_fn = make_simple(name)(fn)  # type: ignore
  File "/Users/super/Downloads/py-gurklang-master/gurklang/builtin_utils.py", line 100, in inner
    new_fn.__name__ = fn.__name__
AttributeError: 'NativeFunction' object has no attribute '__name__'

OS: macOS Catalina 10.15.7
Python Version: 3.9.0