[Mimedefang] mimedefang-filter 2.55 question

[David Benigni]

I'm curious as to why older versions of the min windows filter has
multiple segments of

if ($FoundVirus) {
...
}

in filter, filter_multipart, etc.  Where as in 2.55 it is only in
filter_begin?

Any insights would be great.

TIA,
Dave