binat questions

[Bruce Bauer]

Using OpenBSD 4.0
Using binat for the first time in the real world
Questions:
binat pass on fxp0 from $server_int to any -> $server_ext
does this bypass all other pf filter rules?
binat on fxp0 from $server_int to any -> $server_ext
does this form allow filtering?
Googleing comes up with many different opinions