I'm not sure I see why your code is needed. It appears that the assignment of attributes is done on a "only assign attributes that have been noted as existing."

To paracode, I mean: 

sub new {
  # ...
  for (@valid_keys) {
    if (exists $arg{$_}) { $self->{$_} = $arg{$_} }
  }
}

[download]
is being done already. There doesn't appear to be a need to put a layer on top of that.

_____________________________________________________
Jeff japhy Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-Q)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re: Preventing autovivification of object attributes by japhy
in thread Preventing autovivification of object attributes by nysus

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