Migrate to "pure Python" Cython mode where applicable about falcon HOT 3 OPEN

_M = TypeVar("_M", bound=ModuleType)
def load_uncompiled_module(module: _M) -> _M:
    """Load the non-compied version of a module that is also
    compiled with cython.
    """
    full_name = module.__name__
    assert module.__spec__
    parent_name = module.__spec__.parent
    assert parent_name
    parent_module = sys.modules[parent_name]
    assert parent_module.__spec__
    package_path = parent_module.__spec__.origin
    assert package_path and package_path.endswith("__init__.py")
    name = full_name.split(".")[-1]
    module_path = package_path.replace("__init__.py", f"{name}.py")
    py_spec = importlib.util.spec_from_file_location(full_name, module_path)
    assert py_spec
    py_module = importlib.util.module_from_spec(py_spec)
    assert py_spec.loader
    py_spec.loader.exec_module(py_module)
    return cast(_M, py_module)