uranusjr commented on issue #24014:
URL: https://github.com/apache/airflow/issues/24014#issuecomment-1140863968

   It’s possible, but not particularly doable unfortunately, since it’s 
difficult to tell apart what the user puts in when a function is called. With a 
function like this:
   
   ```python
   def foo(a=None): pass
   ```
   
   We don’t have a good way to tell if user called `foo(a=None)` or `foo()`. 
I’m putting together a PR to make the message slightly more vague so it’s at 
least not misleading, and add some documentation to explain it.


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