PriorityQueue is inheriently broken if subclass attempts to use "heap"
w/generic T bound to anything other then "Object"
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Key: LUCENE-2953
URL: https://issues.apache.org/jira/browse/LUCENE-2953
Project: Lucene - Java
Issue Type: Bug
Reporter: Hoss Man
as discovered in SOLR-2410 the fact that the protected "heap" variable in
PriorityQueue is initialized using an Object[] makes it impossible for
subclasses of PriorityQueue to exist and access the "heap" array unless they
bind the generic to Object.
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