CCC and RFC4217 compliance?

lftp v4.0.4.

In attempting to connect to a ProFTPD server using CCC (ftp:ssl-use-ccc
set to true), I get an issue corresponding with this one[1].

It sounds like lftp doesn't properly support a bi-directional SSL
shutdown when CCC is in use as described in RFC4217 section 12.3.  Is
this the case?

I've tested a few other FTP clients (CoreFTP namely) which don't
exhibit this issue when connecting to my ProFTPD server using CCC.

I'm curious if the lftp devs consider this a "bug" or not.  I know CCC
implementations vary and there's some gray area in the RFC as to how
the shutdowns should be implemented...

Ray

[1] http://bugs.proftpd.org/show_bug.cgi?id=2994