Second one just returns undef for me. There does exist a (lowercase) cgi.pm though.

Undef? That's what I expected. On my system (5.26.2 on osx) the case-typo unexpectedly triggers the proper search but then unexpectedly propagates the wrong case to the filename and module values:

> perl -MModule::Metadata -MData::Dumper -le "print(Dumper(Module::Met
+adata->new_from_module('Data::DUMPer')))"
$VAR1 = bless( {
                 'inc' => [
                            '/path/to'
                          ],
                 'pod' => {},
                 'packages' => [
                                 'Data::Dumper'
                               ],
                 'version' => undef,
                 'collect_pod' => undef,
                 'versions' => {
                                 'Data::Dumper' => bless( {
                                                            'original'
+ => '2.167',
                                                            'version' 
+=> [
                                                                      
+     2,
                                                                      
+     167
                                                                      
+   ]
                                                          }, 'version'
+ )
                               },
                 'pod_headings' => [
                                     'NAME',
                                     'SYNOPSIS',
                                     'DESCRIPTION',
                                     'Methods',
                                     'Functions',
                                     'Configuration Variables or Metho
+ds',
                                     'Exports',
                                     'EXAMPLES',
                                     'BUGS',
                                     'NOTE',
                                     'AUTHOR',
                                     'VERSION',
                                     'SEE ALSO'
                                   ],
                 'module' => 'Data::DUMPer',
                 'filename' => '/path/to/Data/DUMPer.pm'
               }, 'Module::Metadata' );


> perl -MModule::Metadata -le'print $Module::Metadata::VERSION'
1.000033 (current)
[download]

Oh, you're using OS X? That makes sense then. The OS X file system (HFS) is case-insensitive. CGI.pm and cgi.pm are the same file.

It will report the same case for the module name but not the package name, because modules are files but packages are namespaces.

toby döt ink

That's not a cgi.pm but a script with a =head1 NAME section indicating its name is 'cgi'. PAUSE no longer considers modules of different casing to be separately indexed, for many reasons like this.