These can be generated as stated by the GC because of circular references. This can mean that a child object created by a parent object contains a reference or pointer to its parent thus creating a circular reference. Parent holds reference to child, child holds reference to parent. You should be able to examine your own code, particularly associative arrays that reference each other. This can occur in some implementations of drill down XML parsing. As to how many can be stacked can "possibly" cause stack problems and eventually device failure. But this is unclear based upon previous posts
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Updated: 11-11-2015 - Completed Keyboard interface
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