Implement IMAP4 non-synchronizing literals (rfc2088)
from the rfc abstract:
The Internet Message Access Protocol [IMAP4] contains the "literal" syntactic construct for communicating strings. When sending a literal from client to server, IMAP4 requires the client to wait for the server to send a command continuation request between sending the octet count and the string data. This document specifies an alternate form of literal which does not require this network round trip.
(from redmine: created on 2014-02-26, closed on 2014-03-13)