Results of calling FindDeviceStringMatch

[Kelly]

I'm writing a program to query HAL and ask for metadata on certain devices, 
but I noticed that FindDeviceStringMatch only works if the property in 
question is a string; if it is an int, then FindDeviceStringMatch returns an 
empty list.  Is this an error, or a limitation, or something?

Also, I notice that the spec doesn't mention what the numbers correspond to in 
pci.device_class.  Is there a list somewhere?
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