Perl is at the mercy of your machine's definitions of various
operations such as type casting, atof() and sprintf().
If your stdio requires a seek or eof between reads and writes
on a particular stream, so does perl. (This doesn't apply to
sysread() and syswrite().)
While none of the built-in data types have any arbitrary size limits (apart from memory size), there are still a few arbitrary limits: a given identifier may not be longer than 255 characters, and no component of your `PATH' may be longer than 255 if you use `-S'. A regular expression may not compile to more than 32767 bytes internally.
Perl actually stands for Pathologically Eclectic Rubbish Lister, but don't tell anyone I said that.