bits 10 to 15 are reserved for future expansion. The the low eight bits
are reserved for local use, e.g., to allow migration from one set of
parameters for a particular transform to a different, incompatible set
-of parameters for the same transform. The high 16 bits have not yet
-been assigned a purpose.
+of parameters for the same transform. Bit 31, if advertised by both
+ends, indicates that a mobile end gets priority in case of crossed MSG1.
+The remaining bits have not yet been assigned a purpose.
-No early capability bits are currently defined.
+Whether a capability number is early depends on its meaning, rather than
+being a static property of its number. That said, the mobile-end-gets
+priority bit (31) is always sent as an `early' capability bit.
MTU handling