Just a shot in the dark (I'm an OO newbie as well), but could you not specify your %fields reference with the class in question? In your Some::Package::new method: 
my $self      = {
    _permitted  => \%{$class::fields},
    %{$class::fields},
  };

[download]

If you then call Some::Package::Sub->new, it uses Some::Package::Sub::%fields, which I think is what you want.

Caveat: I have not tested the above code so, although the syntax checks OK, it might not work at all. But even then, it should give you an idea on how to proceed.

CU
Robartes-

In reply to Re: Inheritence of a Constructor that uses a file-scoped lexical? by robartes
in thread Inheritence of a Constructor that uses a file-scoped lexical? by Orsmo

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.