In the default configuration, options names may be abbreviated to uniqueness, case does not matter, and a single dash is sufficient, even for long option names.
Since case is ignored by default, the two option specifications clash and only one can be used.
To fix this, you should either enable bundling using use Getopt::Long qw(:config bundling)
When configured for bundling, single-character options are matched case sensitive while long options are matched case insensitive.
or enable case sensitive mode using use Getopt::Long qw(:config no_ignore_case).
Fix long standing bug that duplicate options were not detected when the options differ in case while ignore_case is in effect. This will now yield a warning and become a fatal error in a future release.
... which causes test failures in Code::TidyAll if Getopt::Long is new enough.
bin/tidyalldoesBut that doesn't work in Getopt::Long with default settings: https://metacpan.org/pod/Getopt::Long#Getting-Started-with-Getopt::Long
Since case is ignored by default, the two option specifications clash and only one can be used.
To fix this, you should either enable bundling using
use Getopt::Long qw(:config bundling)or enable case sensitive mode using
use Getopt::Long qw(:config no_ignore_case).Getopt::Long has started detecting this bug in version 2.55: https://metacpan.org/dist/Getopt-Long/changes
... which causes test failures in Code::TidyAll if Getopt::Long is new enough.