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Fix Enumerator::Lazy#{to_enum,enum_for} where method is defined in Lazy
Previously, passing to_enum/enum_for a method that was defined in Lazy itself returned wrong results: [1,2,3].to_enum(:map).to_a # => [1, 2, 3] [1,2,3].lazy.to_enum(:map).to_a # => [] I'm not sure why methods that are designed to be lazy do not work with to_enum/enum_for. However, one possible way to work around this bug is to have to_enum/enum_for use the implementation found in Enumerable/Enumerator, which is what this commit does. While this commit works around the problem, it is a band-aid, not a real fix. It doesn't handle aliases of Enumerable::Lazy methods, for instance. A better fix would be appreciated.
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