A curious situation

[Geoffrey Leach]

I maintain the CPAN distribution Audio::TagLib, which is the Perl binding to TagLib. In this case the TagLib version is 1.9.1.

The problem is with Audio::TagLib::ID3v2::FrameList->sortedInsert().

With the list in question containing one item, "TIT2title", a sortedInsert of "TPE1artist" results in:

TIT2title
TPE1artist

on Perl versions less than 18, while on Perl versions 18 and above, the result is:

TPE1artist
TIT2title

What I'm looking for here is to here if anyone has observed a similar anomaly outside of the Perl environment. That would help direct my investigations. 

Thanks.