Oh you bet there is a precedent, Madigan has his experience drawing tentacles. If there is some political thing that is corrupt, mean, or dishonest, Illinois Democrats have done it,
I thought that round of redistricting favored Republicans, and those tentacles were to create a Democratic vote sink. That tentacle in another district running southward along the southeast border of the state was intended to grab Democratic incumbent David Phelps and stick him in a solid Republican district further north.