2 --- Metrics of covariance detection ---
5 with 1 formal type parameter: 13 (92.85%)
8 total formal parameters: 13
9 -- Including `private` properties --
10 covariants: 2 (15.38%)
11 contravariants: 2 (15.38%)
12 bivariants: 7 (53.84%)
13 invariants: 2 (15.38%)
15 -- Excluding `private` properties --
16 covariants: 2 (15.38%)
17 contravariants: 2 (15.38%)
18 bivariants: 7 (53.84%)
19 invariants: 2 (15.38%)