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Purpose of shorted CT through PCB?

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mluna:
I was fixing an online UPS (APC brand), in which I came across this CT (ct2), shorted through the PCB on its primary.  I wonder what's the purpose of doing this if there's no way current flow trough it so it can be sensed.

ahbushnell:
Good question.  Maybe the current divides between the trace and the transformer?  This allows a smaller transformer? 

Someone:
PCB trace as shunt.

David Hess:
Based on using all of the connector pins, the traces will operate as a shunt resistance across the current transformer.

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