From: Siep Korteling <s.korteling@...>
Date: 2010-10-31T06:45:33+09:00
Subject: Undocumented feature: Array#one? (ruby 1.9.2)

In (my) ruby 1.9.2 class Array has an undocumented method #one? . It
takes no arguments and returns true if the array contains one element,
false otherwise. Is this something someone forgot to delete?

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