experimental option -p, which tries to reestablish the connection
to the sftp server in case it is lost. This currently has a few
limitations (found in the man page), but generally works in some
use cases.
Better support might eventually emerge, but since that requires a
plunge into the depths of puffs_framebuf, I need quite a bit of
Fernet Branca to build up my courage before attempting it.
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