In what way does it not work for multi-layers? 

Module::foo(
  blah => 'zap',
  baz => [ 4, 12, 15, 'Fibonacci' ],
  froop => {
    thwap => 'funny'
  },
);

[download]
should work just fine when coerced from @_ to %args. The only thing to watch out for is if the same sub can be used as an object method, then you'll want to check that first: 
  my $self = undef;
  if (ref $_[0] and UNIVERSAL::isa($_[0], __PACKAGE__))
  {
    $self = shift;
  }
  my %args = @_;

[download]
(untested)

Now, granted, a hashref can be faster than this, but that wasn't your question.

In reply to Re: enabling OO and non-OO access to the same module using a hash reference by Tanktalus
in thread enabling OO and non-OO access to the same module using a hash reference by Moron

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