Tl;Dr , but I don't think there is anything wrong with Exporter it's just the way local works. (See my other post which replicates the problem without Exporter)

It's localizing the symbol NOT the referenced variable.

Otherwise it would be possible to localize lexical variables too.

Update

Demo in the debugger 

DB<13> my $x = 42; *b = \$x; {local $b= 666; say "$b = $x"}; say "$b =
+ $x"
666 = 42
42 = 42

[download]

Now exporting typeglobs works because the scalar slot is one level deeper, hence local will operate on the same slot

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

In reply to Re^2: 'local' for imported variables doesn't work as expected (1 update) by LanX
in thread 'local' for imported variables doesn't work as expected by muthm

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.