I just played around with it using Devel::Peek to see what the values in the sequence are

Good idea - and checking with Devel::Peek::Dump() shows up another anomaly: 
C:\_32>perl -MDevel::Peek -le "@x=('0' .. '2'); Dump $x[0];"
SV = PV(0x54c658) at 0x54bc28
  REFCNT = 1
  FLAGS = (POK,pPOK)
  PV = 0x548438 "0"\0
  CUR = 1
  LEN = 10

C:\_32>perl -MDevel::Peek -le "@x=('1' .. '2'); Dump $x[0];"
SV = IV(0x31bc18) at 0x31bc28
  REFCNT = 1
  FLAGS = (IOK,pIOK)
  IV = 1

[download]
It appears that something being done by the range operator changes the PV '1' to an IV, but leaves the string '0' as a PV.
I wouldn't be surprised if this different treatment is causally related to the unexpected behaviour being exhibited.

Cheers,
Rob

In reply to Re^5: curious behavior: why does it do this? by syphilis
in thread curious behavior: why does it do this? by perl-diddler

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.