I found this in the perlapi manpage:
AvFILL Same as "av_len()". Deprecated, use "av_len()"
instead.
Then I grepped for AvFILL in the source .... There are
about 20 occurrences. I wonder how many more of these
deprecated features are still in the internals. It'd be an interesting task to go through perlapi and patch the source to remove uses of deprecated functions and macros.
--Nat