reject_multi_recipient_bounce & rejected recipients

Currently, reject_multi_recipient_bounce checks whenever
we are about to *accept* more than one recipient, and
does not count other, rejected recipients, so it is
possible to have session like this:

MAIL FROM:<>
250 Ok
RCPT TO:<unknown1@example.com>
550 Address unknown
RCPT TO:<unknown2@example.com>
550 Address unknown
RCPT TO:<known1@example.com>
554 Client host rejected: can not find your hostname, [127.0.0.1]
RCPT TO:<known2@example.com>
250 Ok
RCPT TO:<known3@example.com>
550 <known3@example.com>: Recipient address rejected: Multi-recipient bounce

I think the reject_multi_recipient_bounce should trigger even
at known1@example.com stage, and at least it should not permit
known2@example.com. Technically it is easy to implement, by
changing the test from evaluation number of accepted rcpts
to using additional bit in state field which will be set when
smtpd sees at least one rcpt. But the question first: is such
behaviour ok?

/mjt