Twitch has imposed a 4,000 character limit for DMs. It would be extremely helpful if there was a counter with the composition window that showed a user how many remaining characters may be typed in a message before that limit is reached.

I learned of this limit the hard way; one time I clicked 'Send' on a message, only to get a screen with a red box across the top of it informing me my message had exceeded the character limit and my message hadn't been sent. Unfortunately, the text of that message was lost too.