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    Answers and rating deltas for
    In Swift, how can you test if an object implements an optional protocol method which differs by sign
| Author | Votes | Δ | 
|---|---|---|
| Shivam Gaur | 2 | +5.91 | 
| Hamish | 0 | -0.74 | 
Last visited: Jan 1, 2019, 8:55:20 AM