msgpack/msgpack-python — pull request #7 by steeve (2012-02-28 14:38:31+00:00)
Title: Fix massive memory leak with object_hook and list_hook when unpacking.

Test case:
```python
import msgpack

for _ in xrange(10000000):
payload = msgpack.packs({"some": "dict"})
unpack = msgpack.unpacks(payload, object_hook=lambda x: x)
```

Without this patch, since *c original ref count isn't decreased, the python process will grow indefinitely.