pnic vs. pnic in networkInfo

I have found strange thing,

when I call host.configManager.networkSystem.networkInfo.pnic , I receive Array of VcPhysicalNic

But when I call host.configManager.networkSystem.networkInfo.vswitch[0].pnic , I receive Array of String (looks to be Array of ....pnic.key)

I'm using Orchestrator 7.0.1. Is it so by design? Is there some other easy way to get physical NICs connected to the standard virtual switch?

maaca