USB4 · declared feature checker
Does every segment declare the feature you need?
USB-C shape and headline Gbps are not enough. Record the weakest link and keep optional tunnel support explicit.
Declared path
Rates and features are different checks
USB4 transports multiple protocols, but a target use case still depends on both ends, the cable, operating-system policy, and the exact accessory. Select Unknown when a specification does not explicitly establish a required feature.