# Bad
sub bar {
    my $self = shift;
    my %options = @_;
}
[download]

I have to disagree with you on this one, sort of. I use this construct to set defaults to named parameters like this:

sub bar {
    my $self = shift;
    my %options = (opt1=>'foo', # desc for opt1
                   opt2=>'bar', # desc for opt2
                   @_);
}
[download]

To me, this is the best of both worlds. I get an obvious object ($self), I know what my expected named arguments are, their default values, and a brief description of each parameter. Yes, it's slightly more memory intensive, but it's so much more intuitive to me that I'll take the tradeoff anyday.

As someone else said, I'll take maintainability over a little verboseness & overhead anyday. Being able to figure out what the heck a rarely used option does is invaluable 4 months (or years!) down the road.

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