perldoc strangeness

I just noticed something strange with my perldoc (v5.8.6 built for
darwin-thread-multi-2level): some perldoc -f doesn't return anything
for a number of functions, particularly, it seems, a number of the
functions for SCALRs and strings. I noticied it first with chr, but
none of the functions below work. perldoc doesn't say "No
documentation found," it just exits with output. The list of things
I've tried so far:

chr
ord
index
rindex
lc
uc
lcfirst
ucfirst
chroot
hex
abs
bless
chop (chomp, though, seems fine)

I'm sure there are others.

Is this normal behavior?

Thanks,

-- jay
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