There are plenty of good features that are worth upgrading for in 5.14, but this is not one of them.

Even when writing code that requires Perl 5.14, I avoid this new feature, preferring to use an explicit @{} dereference operation.

As chromatic has pointed out before, when combined with the fact that Perl 5.12 allows each, keys and values to work on arrays like they do on hashes, this feature introduces ambiguities. (What happens in blessed arrayrefs which overload hashrefification? Or blessed hashrefs which overload arrayfication? Or blessed scalar refs which overload both?!)

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

In reply to Re: Is auto-dereferencing worth forcing upgrades to newer versions of Perl? by tobyink
in thread Is auto-dereferencing worth forcing upgrades to newer versions of Perl? by boftx

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.