weight: ensure hvector types are always loaded
weight: ensure hvector types are always loaded

If debug.debug.local_debug_flag was True, the code would use dict and
float to mimic the custom defaultdict and double implementations, but
that would result in errors because 'float' is not iterable, and dict
does not have a .evaluate() method.

sfu-natlang/glm-parser,sfu-natlang/glm-parser,sfu-natlang/glm-parser,sfu-natlang/glm-parser