The `inspect.iscoroutinefunction` and `inspect.iscoroutine` functions return `False` for the `asend`, `athrow` and `aclose` methods of asynchronous generators (PEP 525). These are coroutine functions (i.e. one does e.g. `await gen.asend(value)`) so I would have expected these to return `True`.

Example:

```python
async def generator():
    return
    yield
```

```python
>>> import inspect
>>> g = generator()
>>> inspect.iscoroutinefunction(g.asend)
False

>>> inspect.iscoroutine(g.asend(None))
False
```

This seems to be a duplicate of https://bugs.python.org/issue37190