The draft in question has nothing to do with MPLS; clarify that.

The draft in question has nothing to do with MPLS; clarify that.
Presumably the idea is that the technique is generally applicable as
long as the traffic being carried is either IPv4, IPv6, OSI CLNP, ES-IS,
or IS-IS.

Also, by the time we get there, we know we've reached the bottom of the
MPLS stack (the do loop either fails by running past the end of the
packet and going to trunc, or by terminating because we find a label
entry with the BOS bit set); there's no need to check for that.