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Name	Action
..
CaseFolding.php	Edit
CaseFoldingData.php	Edit
CaseFoldingDataInterface.php	Edit
NamePrep.php	Edit
NamePrepData2003.php	Edit
NamePrepData2008.php	Edit
NamePrepDataInterface.php	Edit
NamePrepInterface.php	Edit

Editing: CaseFolding.php

<?php declare(strict_types=1); namespace Algo26\IdnaConvert\NamePrep; class CaseFolding { /** @var CaseFoldingData */ private $caseFoldingData; public function __construct() { $this->caseFoldingData = new CaseFoldingData(); } public function apply(array $inputArray, string $idnaVersion): array { if ($idnaVersion == 2003) { return $inputArray; } $outputArray = []; foreach ($inputArray as $codePoint) { if (isset($this->caseFoldingData->foldingMap[$codePoint])) { foreach ($this->caseFoldingData->foldingMap[$codePoint] as $folded) { $outputArray[] = $folded; } } else { $outputArray[] = $codePoint; } } return $outputArray; } }