Potential TagReference object double free

[plafosse]

Using latest dev with active object counters for TagReference objects open a binary with tags applied, observe:

>>> get_memory_usage_info()['Active TagReference objects']
18446744073709551597

IDK why this is happening, one of two options that I can conjecture.

1. The active object counter is broken somehow.
2. The active object counter is getting double decremented perhaps indicating a double free (I have no other reason to believe this is a double free)