Cannot fetch properties `kAudioObjectPropertyFirmwareVersion` and `kAudioObjectPropertySerialNumber`

[gchilds]

Other properties from the same set, like kAudioObjectPropertyManufacturer, do work.

Calls to AudioObjectHasProperty() and AudioObjectGetPropertyData() don't seem to even reach the Bridge, so the issue might lie outside libASPL.

AudioObjectGetPropertyData() returns kAudioHardwareUnknownPropertyError = who?.