Commits on May 1, 2014

1. Optimize key-based Hash access for empty hashes …

   This avoids performing the potentially expensive hash computation in
   the event that the Hash is empty, as there cannot possibly be a match.

   

   grddev committed May 1, 2014
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2. Conform to MRI behaviour for empty hashes …

   In the event that the `#hash` method has side effects, any optimisation
   with respect to empty hashes will affect the results of the operations.
   
   For MRI, the empty-hash optimisation seems to be applied everywhere in
   2.0.0 and beyond. In 1.9.3 the #hash method is not called for #[] and
   #key?, but strangely enough the performance is not improved for empty
   hashes. In 1.8.7, the #hash method is always called even if empty.
   
   This does not match the semantics of MRI exactly, as this avoids calling
   the #hash method from #values_at in 1.9.3, but that would be slightly
   more involved to implement.

   

   grddev committed May 1, 2014
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