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https://issues.apache.org/jira/browse/LUCENE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14496364#comment-14496364
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Adrien Grand commented on LUCENE-6427:
--------------------------------------

bq. Perhaps the doc comment should only be left on the constructor and moved to 
a 'normal' comment for other methods.

+1

bq. I needed the checkEmpty method I do use nextSetBit(0) for now, but that 
will throw an exception if the BitSet has 0 size...

OK I see. Then can you rename to isEmpty() for consistency with java 
collections?

bq. I did use the random() object

Sorry I somehow misread your code!

> BitSet fixes - assert on presence of 'ghost bits' and others
> ------------------------------------------------------------
>
>                 Key: LUCENE-6427
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6427
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/other
>            Reporter: Luc Vanlerberghe
>
> Fixes after reviewing org.apache.lucene.util.FixedBitSet, LongBitSet and 
> corresponding tests:
> * Some methods rely on the fact that no bits are set after numBits (what I 
> call 'ghost' bits here).
> ** cardinality, nextSetBit, intersects and others may yield wrong results
> ** If ghost bits are present, they may become visible after ensureCapacity is 
> called.
> ** The tests deliberately create bitsets with ghost bits, but then do not 
> detect these failures
> * FixedBitSet.cardinality scans the complete backing array, even if only 
> numWords are in use



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