Limitations of gapi.client.storage.objects.insert()

[Capstan]

The comment

Note: gapi.client.storage.objects.insert() can only insert small objects (under 64k)

I think is not even true anymore. We used to allow metadata-only inserts for v1beta1, but that is gone now. Can gapi's generated insert() method perform any of the media upload models, or are we stuck doing everything "by hand"?

/cc @jgeewax