How can I specify 'all keys' when cutting or pasting in Python?

In mel, when copying or pasting all keframes, the syntax is pretty simple (replace ... with the rest of the command code):

cutKey -time ":" ... ;

And even the Python command docs say this:

-time ":" is a short form to specify all keys.

But that's not how the Python formatting actually works.
Per Maya Docs -> User Guide -> General -> Python -> Using Python -> Ranges ->
You need to specify the time settings in this format:

mc.cutKey(time=(":",), ...)