From: Joel VanderWerf <vjoel@...>
Date: 2004-12-04T16:39:30+09:00
Subject: Hash#eql? and Hash key testing


The ri docs for Object#eql? say:

      The +eql?+ method returns +true+ if _obj_ and _anObject_ have the
      same value. Used by +Hash+ to test members for equality.

However, the second sentence doesn't seem to be consistent with the 
behavior of Hash (and Set):

   h1 = {1=>2, 3=>4}
   h2 = {1=>2, 3=>4}

   p h1.eql?(h2) # ==> true

   h={h1=>true}

   p h[h1] # ==> true
   p h[h2] # ==> nil

Based on the docs, I would have expected

   p h[h2] # ==> true

Have I misunderstood?