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This document seems pretty clear and well-written.  I didn't find any real transport / WIT concerns to note.

In Table 3, the examples in the the "subnets" row (["2001:db8::1", "192.0.2.0/24"] made me wonder if the description of this should be specified better, in order to avoid some possible bugs/incompatibilities.  The paragraph describing the format just says "written using CIDR notation", which matches the example IPv4 subnet, but the example also includes an IPv6 address (which doesn't have a "/N", etc.).  For IPv6, I think RFC 4291, section 2.3 might be the right thing to reference, and that the example might not actually be correct if this is really supposed to be "subnets", otherwise the description should say it's subnets as well as specific IP addresses.