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An Elo-based rating system for Stack Overflow
                
    Answers and rating deltas for
    How do I get the type signature to agree with the scala compiler when extracting a value out of an O
| Author | Votes | Δ | 
|---|---|---|
| Luis Miguel Mejía Suárez | 2 | +2.61 | 
| Karl Bielefeldt | 1 | -0.64 | 
| Yuval Itzchakov | 1 | -1.97 | 
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