We have had so many hard to trace bugs because developer A changed some variable (sometimes inadvertently) that then screwed developer B...The developer who went and made the DS writable was certainly breaking the rules.

Setting the data structure writable can't be done "inadvertently".

If it happens once; you put it down to 'didn't know better', admonish the guy and move on.

If it happens twice; you put it down to 'thinks he know better', give the guy a written formal warning that any repetition will be considered deliberate sabotage, and result in both dismissal, and reporting to the authorities with a view to criminal prosecution.

And more specifically I was trying to learn some details about the Internals package and what might happen if I start messing with it.

Anything you can do--your malicious programmer can undo. Far better to be rid of the problem than chase a protracted technological arms race.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP an inspiration; A true Folk's Guy

In reply to Re^3: redefining Internals::SvREADONLY by BrowserUk
in thread redefining Internals::SvREADONLY by ChiefAl

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.