I'd call you example
pitfall or
trap for the unwary
rather than a
hidden treasure. It's normal behaviour, and
no, there is no such book - there's the perl documentation. Perl
just
is like that, it's all about context.
Oh, wait - if you seek odd things, unexpected behaviour and such, have a
look at The Golf Book.
_($_=" "x(1<<5)."?\n".q·/)Oo. G°\ /
/\_¯/(q /
---------------------------- \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}