towards integrating masks into the actual loop
partitions work at least
something is wrong!
fixed slicecopy's dimension params.
something is broken... not sure what. Somethign in pruning?!?
(probably)
parsing unit tests . something is wrong in pruning
don't need range copy anymore.
improve the slice copy test a little
trying to figure out what's going on with pruning. not much success so far
finally.