>
> The indentation of some of the new code in `IkiWiki/Plugin/calendar.pm`
> is weird. Please use one hard tab (U+0009) per indent step: you seem
>
> The indentation of some of the new code in `IkiWiki/Plugin/calendar.pm`
> is weird. Please use one hard tab (U+0009) per indent step: you seem
> (a scalar that is a reference to an empty anonymous hash).
>
> However, that whole `if` block can be omitted, and you can just use
> `$changed{$params{year}}{$params{month}} = 1;`, because Perl will automatically
> (a scalar that is a reference to an empty anonymous hash).
>
> However, that whole `if` block can be omitted, and you can just use
> `$changed{$params{year}}{$params{month}} = 1;`, because Perl will automatically