[pcp] Barry Leiba's No Objection on draft-ietf-pcp-port-set-12: (with COMMENT)

["Barry Leiba" <[e-mail]>]

Barry Leiba has entered the following ballot position for
draft-ietf-pcp-port-set-12: No Objection

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COMMENT:
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Just one question about Port Set Size = 1:

In Section 4.1:

   A PCP client MUST NOT send a PORT_SET option for single-port PCP MAP
   requests (including creation, renewal, and deletion).

...but earlier, in Section 4:

   Port Set Size:  Number of ports requested.  MUST NOT be zero.

Should the Port Set Size definition instead say "MUST be greater than
1.", given what 4.1 says?

...and in Section 4.2:

   o  If the Port Set Size is zero, a MALFORMED_OPTION error is
      returned.

What happens if Port Set Size is 1?  This seems to answer that:

   SHOULD map at least one
   port (which is the same behavior as if Port Set Size is set to 1).

...but how is that allowed, given what Section 4.1 says?