[skitter]

It absolutely is common. People see there is a len function that takes one argument, they call len(some_collection), see that it indeed returns the number of items in the collection like they expect and move on. They don't expect len to return a negative number instead on Thursdays, and of course it doesn't because that would be a pretty big footgun. People also see that there is a create_task function that takes a coroutine, they call create_task(some_coroutine), see that the coroutine indeed runs like they expect, and move on. Sure, you're supposed to await the result, but maybe they don't need the awaited value anymore, only the side effects, and see that it still works.