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Reports <code>equals()</code> methods taking an argument type other than
<code>java.lang.Object</code> if the containing class does not have other overloads of
<code>equals()</code> that take <code>java.lang.Object</code> as
its argument type.
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  A covariant version of <code>equals()</code> does not override the
  <code>Object.equals(Object)</code> method. It may cause unexpected
  behavior at runtime. For example, if the class is used to construct
  one of the standard collection classes, 