Unable to generate yaml for functions decorated with functools.lru_cache

[JamesLTaylor]

The issue appears to be when the decorator replaces the function with an instance of a python class.

This repo demonstrates the error.

In short if there is a function like

@lru_cache(maxsize=128)
def cached_adder(a: int, b: int) -> int:

Then sphinx-docfx-yaml produces an error like:

Can't inspect type <class 'functools._lru_cache_wrapper'>: utils.curry_and_docfx.cached_adder

Exception occurred:
  File "c:\dev\python\curry-test\venv\lib\site-packages\docfx_yaml\extension.py", line 523, in insert_children_on_class
    insert_class = app.env.docfx_yaml_classes[datam[CLASS]]
KeyError: 'utils.curry_and_docfx'

and no output is produced.