I am using v. 2.1.13 currently.
When you post a comment using user.comment_reply() the comment is returned as a comment.Comment object, but it is missing the datetime attribute. Obviously, this can be handled if the issue is known but it would be nice to have that attribute for consistency's sake. I'm pretty sure that this is the same for project.comment_reply() and studio.comment_reply() as well.
TL:DR can you add .datetime to user.comment_reply()'s returned comment.Comment object, thanks :)