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sub somefunc {
  my($self, $context) = @_;
...
  # I can work with $form
  ...
}

sub is_hash {
  my($hash, @keys) = @_;
...

  return $yes ? $hash : $yes;
}

return 1
  unless my $form = is_hash($self->{config}, 'key1', 'context', $conte
+xt, 'form');

  $somedata, $key1, $key2, $idx3, $key4 ....;

  my $wanted = 'CODE';
  # if key3 has a value but not a CODE ref, it croaks
  my $code = thefunc($somedata, $wanted, 'key1', 'key2', 'key3');
  $code->(@someargs);