Fabric

It’s silly having a “private” class like this, I did so because it was a “local” utility class and I did not want it to show up if anyone did from operations import *. But that should've been a sign to move it to some other module instead, because inevitably someone may want to reuse it or subclass it or use it in isinstance or whatnot.

Now that it’s got actual content instead of being solely a subclass of str, making it a “real” class with its own location makes even more sense.