Clear no-overwrite word ref values when they are exported.  This avoids exporting the current value and ensures they read back as 0/nil/NONE.
Clear no-overwrite word ref values when they are exported.  This avoids
exporting the current value and ensures they read back as 0/nil/NONE.

dcjm/polyml,dcjm/polyml,polyml/polyml,dcjm/polyml,polyml/polyml,polyml/polyml,polyml/polyml,dcjm/polyml