in reply to Re^2: Multi-line comments in perl code?
in thread Multi-line comments in perl code?

=for comment Comment! =cut
... produces:
SECTION Comment!

That is the correct behavior, your conclusion "=for comment hides text from perl but not perldoc" isn't correct. From perlpod (emphasis mine):

The command "=for formatname text..." specifies that the remainder of just this paragraph (starting right after formatname) is in that special format.

Remove the blank line after the =for and the "Comment!" is hidden. The =for still begins a section of POD that needs to be terminated by =cut, so Perl will ignore the entire example you posted.