Now that DMs can be up to 10k characters long the endpoints for direct_messages (GET direct_messages, GET direct_messages/sent and GET direct_messages/show) now accept full_text=true as a query but this is not yet reflected in the docs.
https://dev.twitter.com/rest/reference/get/direct_messages/show https://dev.twitter.com/rest/reference/get/direct_messages/sent https://dev.twitter.com/rest/reference/get/direct_messages
Update shown under “API Update” heading: Removing the 140 character limit from Direct Messages
Thanks - yes, this is on my todo list to fix!
