Andrew (and anyone else), please do not take this code right now.
Until the backdooring of upstream xz[1] is fully understood, we should not
accept any code from Jia Tan, Lasse Collin, or any other folks associated
with tukaani.org. It appears the domain, or at least credentials
associated with Jia Tan, have been used to create an obfuscated ssh
server backdoor via the xz upstream releases since at least 5.6.0.
Without extensive analysis, we should not take any associated code.
It may be worth doing some retrospective analysis of past contributions
as well...