In WWDC2013 Session 702: Efficient Design With XPC, Apple's engineer said this:
They said, if you see any message in system log like this for
assertion failed: 13A476z: libxpc.dylib + 2794 [some UUID value]: 0x11
Please fire a bug report.
If this is not translated into text, people won't be able to find this! So I put this here, and see if this would help anyone. I haven't encountered this kind of error, but it might help someone else who is googling over and try to find something useful.
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