Fix ArrayIndexOutOfBoundsException in mutable.BitSet.<<= #86
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Fix
ArrayIndexOutOfBoundsException
that is thrown by<<=
operation onmutable.BitSet
consisting of more than one empty word.Such
BitSet
is possible in practice, even though it seems to contradict the invariant prescribed in the documentation ("The memory footprint of a bitset is determined by the largest number stored in it."). See the added test case for an example.