Release Notes: In some very rare circumstances, enumeration of hash sets or maps combined with massive element removal (using the iterator remove() method) could have led to inconsistent enumeration. This has been fixed.
Release Notes: Array-based priority queues now cache their first element, and fastutil can be found on Maven Central.
Release Notes: More efficient radix sort methods.
Release Notes: This release adds bugfixes in the TextIO.store() methods and rehashing of big sets.
Release Notes: New methods for indirect queues. Doubly linked implementation for hash maps and sets. New array-based FIFO queues. A number of bugfixes.