I can't find where I read it, but I believe $Net::SFTP::Foreign::debug is a bitmask, so -1 (equivalent to all ones in binary*) is saying "show me everything".

* for 2's compliment based systems

In reply to Re^3: debugging Net::Sftp::Foreign using ssh2 by Anonymous Monk
in thread debugging Net::Sftp::Foreign using ssh2 by sdetweil

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