ISO 15.3.2 The <code>Enumerable</code> mixin provides collection classes with several traversal and searching methods, and with the ability to sort. The class must provide a method <code>each</code>, which yields successive members of the collection. If <code>Enumerable#max</code>, <code>#min</code>, or <code>#sort</code> is used, the objects in the collection must also implement a meaningful <code><=></code> operator, as these methods rely on an ordering between members of the collection.
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