inconsistancy in quotes

[Zen4All]

why are in https://github.com/maxmind/geoip-api-php/src/geoipregionvars.php some numbers in the array surrounded by quotes, and some are not?
In thought they all needed to be in quotes
for example
'AF' => array ( '01' => 'Badakhshan', '02' => 'Badghis', '03' => 'Baghlan', '05' => 'Bamian', '06' => 'Farah', '07' => 'Faryab', '08' => 'Ghazni', '09' => 'Ghowr', 10 => 'Helmand', 11 => 'Herat', 13 => 'Kabol', 14 => 'Kapisa', 17 => 'Lowgar', 18 => 'Nangarhar', 19 => 'Nimruz', 23 => 'Kandahar', 24 => 'Kondoz', 26 => 'Takhar', 27 => 'Vardak', 28 => 'Zabol', 29 => 'Paktika', 30 => 'Balkh', 31 => 'Jowzjan', 32 => 'Samangan', 33 => 'Sar-e Pol', 34 => 'Konar', 35 => 'Laghman', 36 => 'Paktia', 37 => 'Khowst', 38 => 'Nurestan', 39 => 'Oruzgan', 40 => 'Parvan', 41 => 'Daykondi', 42 => 'Panjshir', ),

[oschwald]

Are you trying to solve a particular problem? That file is automatically generated. The ones with quotes have a leading 0 that needs to be quoted to be interpreted correctly.

[Zen4All]

No particular problem just an observation ;) . I was doing a comparison with an older version of the file, and they had all double quotes.