|Shrinks the cuboid by the given amount in just one direction, and returns the changed cuboid.
If a coordinate is positive, it will shrink the high value. If it is negative, it will shrink the low value.
Note that you can also specify a single number to expand all coordinates by the same amount (equivalent to specifying a location that is that value on X, Y, and Z).
Inverted by CuboidTag.expand_one_side
Not valid for multi-member CuboidTags.
If you shrink past the limits of the cuboid's size, the cuboid will flip and start expanding the opposite direction.