anchor.diff:        set.add("root/path/to/two");
         set.remove("root/path/to/two");
   
  -      expect(set.toSet(), unorderedEquals(["root/path/to/one"]));
  +      expect(set.toSet(), unorderedEquals([p.normalizze("root/path/to/one")]));
       });
     });
   
  
positive.code:     test("that's not normalized removes and returns the normalized path", () {
        set.add("root/path/to/file");
        expect(set.remove("root/../root/path/to/../to/./file"),
            unorderedEquals(["root/path/to/file"]));
      });
  
      test("that's absolute removes and returns the normalized path", () {
        set.add("root/path/to/file");
        expect(set.remove(p.absolute("root/path/to/file")),
            unorderedEquals(["root/path/to/file"]));
      });
  
      test("that's not beneath the root throws an error", () {
  
negative.code:         "root/path/to/one",
          "root/path/to/two",
          "root/path/to/sub/three"
        ].map(p.normalize)));
  
        expect(set, containsPath("root/outside"));
        expect(set, isNot(containsPath("root/path/to/one")));
  