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A comment on Reading the Ruby Source to Understand Rails Idiosyncrasies. Parent comment

Re:Reading the Ruby Source to Understand Rails Idiosyncrasies by norswap on Saturday July 20, 2013 @05:18PM (#6076615)
Ranges are always continuous, but `cover?` uses the comparison operators, while `include?` iterates over the items in the range in some cases. `include?` is practical in cases where you don't want to implement the comparison operators.

See https://news.ycombinator.com/item?id=6076608

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