spurious synproxy warning from pfctl

Given the rule

pass proto tcp from any to mail.example.com \
port { 25 80 110 143 443 587 993 } synproxy state

pfctl barks

/etc/pf.conf:586: warning: synproxy used for inbound rules only, ignored for outbound

It's pretty obvious from reading pf.conf(5) that the above is the
default behaviour, and it seems perfectly reasonable to apply
'synproxy state' to pass rule that implies 'in'. So I don't see
the reason for pfctl to nag at me like that,

It would be nice if simple pass rules like the above did not provoke
that warning message.

--lyndon