Re^3: What could make "()" a good value for boolean false?

[ikegami]

I hope not, because I'm opposed to it. Sub that are expected to return a scalar shouldn't suddenly return nothing. It causes subtle problems that aren't caught by the compiler.

Consider what happens if type suddenly returned nothing instead of `undef`:

my $h = {
   type => type(),
   name => name(),
};

return (); should be used for subs that are expected to return a list.

return undef; should be used for subs that are expected to return a scalar. There are exceptions, of course.