Strange errors when trying to fix DateTime::Event::Nameday

[Ben Bennett]

Ok, I am trying to fix the broken tests in DateTime::Event::NameDay
and am getting the error 'Span cannot start after the end in
DateTime::Span->from_datetimes'.  However my span looks perfectly
valid...

So I boiled it down to a simple test case:
--
#!/usr/local/lib/perl -w

use strict;

use DateTime;
use DateTime::Span;
use DateTime::Calendar::Christian;


my $dt1 = DateTime->new
    ( year   => 1752,
      month  => 1,
      day    => 1,
      );
my $dt2 = DateTime::Calendar::Christian->new
    ( year   => 1755,
      month  => 1,
      day    => 3,
      reform_date => $dt1,
      );

my $sp = DateTime::Span->new(start => $dt1, end => $dt2);
--

This gives me two types of error:
--
Use of uninitialized value in numeric ne (!=) at 
/usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/DateTime.pm line 1174.
Use of uninitialized value in numeric comparison (<=>) at 
/usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/DateTime.pm line 1174.
Span cannot start after the end in DateTime::Span->from_datetimes
--

What am I doing wrong?  (This is using the latest CVS versions of
things) and the relevant lines from DateTime.pm are:

-- (> marks line 1174).
     foreach my $component ( qw( utc_rd_days utc_rd_secs rd_nanosecs ) )
     {
>        return $dt1->{$component} <=> $dt2->{$component}
             if $dt1->{$component} != $dt2->{$component};
     }
--

Thanks,

-ben