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use Net::SFTP::Foreign
my @sftp_opts = ();
...
    key_path => $config{'key'},
    more => [ @sftp_options ]
);

my @ssh_opts = ();
push @ssh_opts, "-o";
...

my $ssh = Net::OpenSSH->new($config{'host'}, user => $config{'user'}, 
+port => $config{'port'}, key_path => $config{'key_path'}, ssh_opts =>
+ [ @ssh_opts ]);
# Returns Invalid or bad combination of options ('ssh_opts')