[elephant-ticket] #2: Add :inverse-reader option to class slot definitions

[elephant]

#2: Add :inverse-reader option to class slot definitions
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 Reporter:  ieslick                 |       Owner:  ieslick      
     Type:  defect                  |      Status:  new          
 Priority:  minor                   |   Milestone:  Release 0.7.0
Component:  component1              |     Version:               
 Keywords:  metaprotocol, features  |  
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 The :inverse-reader option allows you to define a get-instances-by-value
 for your class and slot.  Merely pass a value and get back a list of
 instances.  Not sure how important or useful this is, but it is an
 interesting feature to keep track of for later implementation.

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Ticket URL: <http://trac.common-lisp.net/elephant/ticket/2>
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