Subject: | Discourage use of PM_FILTER |
PM_FILTER is, unfortunately, not cross-platform in the slightest. Its
basically just a shell command. For this reason its use should be
discourage in the documentation. Once the functionality has been
duplicated in a safer form it will be deprecated.
One possiblity is to allow passing of a subroutine ref. Read from
STDIN, write to STDOUT.