When I look at the documentation for functions like upload_fileobj, it's not clear that boto3 will close the file for me.

I have a use case where I have a zip file in a BytesIO, I want to upload it and unzip it.
I assumed boto wouldn't close the file for me, but it does.
That's fine, since the code unzipping this won't close it, so I can just swap the order.

But the documentation should clarify what the behavior is, right there where it explains that the argument is a file-like object.

e.g.

Fileobj (a file-like object) -- A file-like object to upload. At a minimum, it must implement the read method, and must return bytes. This function will have .close() called on it.