Sketch.located does not seem to have any effect

Sketch.located does not seem to have any effect whenever and wherever it is called.
Perhaps an example of what it is supposed to do would help. I see that it is setting `self.locs` but it really does not seem to do anything whether I call it at the beginning/middle/end of sketching, it also does not seem to affect `Workplane.placeSketch` and I'm out of ides of what it should affect and when.