Confidence levels are a number from 0 to 1, not strings.

String comparision happened to work because the numbers are always less than 1.
You can't mess up 0.1 with 0.09 like you can 10 vs 9. It's still not good to tempt fate.

Author: schwern

lib/TAP/Parser/IteratorFactory.pm

@@ -265,7 +265,7 @@ sub detect_source {
     # if multiple handlers can handle it, choose the most confident one
     my @handlers = (
         map    {$_}
-          sort { $handlers{$a} cmp $handlers{$b} }
+          sort { $handlers{$a} <=> $handlers{$b} }
           keys %handlers
     );
 

t/lib/MyFileSourceHandler.pm

@@ -20,7 +20,7 @@ sub can_handle {
     my $class = shift;
     $class->SUPER::can_handle(@_);
     $CAN_HANDLE++;
-    return $class;
+    return 1;
 }
 
 sub make_iterator {