fix bogosity caused by uninitialized memory
Revert "Revert "use nash for cue""

This reverts commit 04caeff12f5e471519082b1c5f3020943df136db.

Medical science made some advances by leaps and bounds. The nash code is
more aggressive with the allocator and leaves more garbage around for
e.g. u2_term_io_init to trip over.