Implement Variance. List and Dict are now invariant! #54
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| elif self.variance == Variance.Contravariant: | ||
| return self.base <= other.base and self.item >= other.item | ||
| elif self.variance == Variance.Invariant: | ||
| return self.base <= other.base and self.item == other.item |
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Instead of raising a generic RuntimeError, it's better to throw a more specific error that details what the issue is (for instance, 'Unexpected value for variance')
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