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tracing garbage collectors, particularly incremental ones, can require additional space for other purposes.
* The naive algorithm described above can't handle , an object which refers directly or indirectly to itself. A mechanism relying purely on reference counts will never consider cyclic chains of objects for deletion, since their reference count is guaranteed to stay nonzero (cf. picture). Methods for dealing with this issue exist but can also increase the overhead and complexity of reference counting -- on the other hand, these

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