Hmm...wonder what this means about the status of the Quad-color bitmapped arena mark-n-sweep collector Mike was planning for LuaJIT 3.0 (http://wiki.luajit.org/

Hmm...wonder what this means about the status of the Quad-color bitmapped arena mark-n-sweep collector Mike was planning for LuaJIT 3.0 (http://wiki.luajit.org/New-Garbage-Collector http://wiki.luajit.org/New-Garbage-Collector)? I remember reading what he had researched so far a couple years back and being really excited, but it seems like the work was never really continued. I'd be interested to know if there was some fatal flaw that would've kept the collector from living up to its potential? or was it just a matter of the sizable effort required to write a new collector, more-or-less from scratch?